Question on expected values

Given the following 2x2 table:

Myocardial Infarction Status
Yes No


OC User         683 2537
Non-OC user 1498 8747

Calculate the expected value for an OC user and no myocardial infarction. The TA said "2537", which may be correct, but I think some kind of chi-square goodness of fit or a similar test is needed to see what the "expected value" would be or how it would fit a normal distribution. I have waded through some reference material that would indicate there is a way to solve for the expected value, given the sample, but am unclear on how to work this.