1. **State the problem:** Calculate the sum of 91387 and 2998.74. 2. **Write the addition expression:** $$91387 + 2998.74$$ 3. **Add the numbers:** Since 2998.74 has decimal places, align the decimal points: $$91387.00 + 2998.74 = 94385.74$$ 4. **Final answer:** $$94385.74$$ This is the sum of 91387 and 2998.74.