To determine the time of the person who came in third place, we first need to arrange the times of the swimmers in ascending order:
- 68.92 seconds (1st place)
- 69.15 seconds (2nd place)
- 72.3 seconds (3rd place)
- 73.2 seconds (4th place)
From this list, the time of the person who came in third place is 72.3 seconds.