Step 1: Understand the given expression.
The total number of male blood donors is calculated using the formula \( 560 + 120 - (227.5 + 315) \). Simplifying the expression:
\[
560 + 120 = 680
227.5 + 315 = 542.5
680 - 542.5 = 1363
\]
Thus, the total number of male blood donors is 1363.
Step 2: Conclusion.
The correct total number of male blood donors is 1363, corresponding to option (3).