To solve this problem, we can use the formula for the sum of an arithmetic series:

Sn = (n/2)(a + L)

where Sn is the sum of the series, n is the number of terms, a is the first term, and L is the last term.

In this case, the first term is x + 2 and the last term is x + 98. The number of terms is 98 - 2 + 1 = 97.

Plugging these values into the formula, we get:

9700 = (97/2)(2x + 100)

Simplifying, we have:

9700 = 97(x + 50)

Dividing both sides by 97, we get:

100 = x + 50

Subtracting 50 from both sides, we have:

x = 50

Therefore, the value of x is 50.