Compare the numbers digit by digit, starting from the ten-thousands place.<br><br>Ten-thousands digits: 8, 8, 8, 8. Numbers with the same ten-thousands digit are further compared at the thousands, hundreds, tens, and ones places.<br><br>From largest to smallest:<br>&bull; 84721 (greatest)<br>&bull; 84217<br>&bull; 82471<br>&bull; 82147 (smallest)<br><br>Final Answer: 84721, 84217, 82471, 82147