So you look at the 2 in the 428,731 and that is less than 5, so the estimate is, 400,000 and you look at the 7 in 175,842 and that is more than 5, so the estimate is 200,000 (if you want to estimate to the hundred thousands..) and if you want the answer.. i can give it to you in another comment because you are just saying to just give you the estimate.
