Let the smallest number be x.
Th numbers are
1st number = x,
2nd number= x + 2,
3rd number = x + 4,
4th number = x + 6,
5th number = x + 8
The sum is 310
x + x + 2 + x + 4 + x + 6 + x + 8 = 310
5x + 20 = 310
5x = 290
x = 58
3rd number = x + 4 = 58 + 4 = 62
Answer: 62