1. **Problem:** Round 86,999,732 to the nearest thousand. 2. **Formula and rule:** To round to the nearest thousand, look at the hundreds digit. 3. The number is 86,999,732. 4. The thousands digit is 9 (in 999), and the hundreds digit is 7. 5. Since the hundreds digit (7) is 5 or more, round the thousands digit up by 1. 6. Increase 999 thousands by 1 to 1000 thousands, which means the number rounds to 87,000,000. 7. **Final answer:** 87,000,000