Answer:
500
Step-by-step explanation:
Hello!
Let the smallest number be x. The next number would be x + 1, then the next would be x + 2, then x + 3.
The sum of these four is 1998.
Solve for x:
The third number is (x + 2), so simply add 2 to 498 = 500
The third number is 500.
All 4 numbers are 498, 499, 500, and 501.