The nearest thousand of 8723 is 9000. When rounding to the nearest thousand, we look at the hundreds place, which in this case is 7. Since 7 is closer to 10 than to 0, we round up to the next thousand, which is 9000.
9000
9000
9000
9000
9000
9000
9000
9000
9000
9000
9000
9000
1523
9000
9000
9000