Who was Italy's fourth baseman at the Winter Olympics

I'm not sure exactly what program's fourth baseman you are referring to with your question. In biathlon, the fourth baseman is Elvira.

Here are Italy's race records.

On Feb. 5, 2022, Italy's Lollobrigida got the silver medal in the women's speed skating 3,000 meters in 3 minutes, 58 seconds and 06 seconds.

On February 6, 2022, in the men's double pursuit (15km traditional technique + 15km free technique) in cross-country skiing at the 2022 Beijing Winter Olympics, Francesco De Fabbiani finished 8th with a time of 1:19:47.6; Paolo Ventura finished 34th with a time of 1:24:00.4; Giandomenico Salvadori finished 1st with a time of 1. 26:10.7 for 48th place.On February 6, 2022, during the Men's Single Luge at the Beijing 2022 Winter Olympics, Dominic Fischnerer won the bronze medal with a time of 3:49.686.On February 7, 2022, during the Men's Snowboarding Slopestyle Skills Final at the 2022 Winter Olympics in Beijing, Italy's Emiliano Rauzzi finished in 5th place On the same day, in the Alpine Skiing Women's Giant Slalom at the 2022 Beijing Winter Olympics, Federica Brignone finished 2nd with a time of 1:55.97; Elena Curtoni finished 20th with a time of 1:59.91; and in the Women's 500-meter Short Track Speed Skating Final at the 2022 Beijing Winter Olympics, Arianna Fontana won the title with a time of 42.488. On February 8, 2022, Italy's Federico Pellegrino won the silver medal in the Men's Individual Short Distance (Free Technique) Final of Cross-Country Skiing at the 2022 Beijing Winter Olympics.

On Feb. 11, 2022, Dorotea Verrell of Italy won the bronze medal in the Women's 7.5km Short Distance Race in Biathlon at the 2022 Beijing Winter Olympics.

On Feb. 15, 2022, in the Alpine Skiing - Women's Downhill at the 2022 Beijing Winter Olympics, Sofia Goggia took second place with a time of 1:32.03, Nadia Drago took third place with a time of 1:32.44, Elena Curtoni took fifth place with a time of 1:32.87, and Nicole Drago with a 1:33.69 time to finish 11th.

On February 17, 2022, Italy finished ninth in the cross-country skiing team - ski jumping big jump/cross-country skiing 4×5km relay at the Beijing 2022 Winter Olympics.

On February 19, 2022, Francesca Lollobrigida of Italy won the bronze medal in the Women's Team Start Final at the Beijing 2022 Winter Olympics.