#### Answer

$9421$

#### Work Step by Step

Given the numbers $4, 1, 9, 2$ we place the largest digit in the largest valued column.
Therefore, $9$ will be placed in the thousands column.
Next we place the second largest digit in the second largest valued column.
Therefore the $4$ will be placed in the hundreds column.
Next we place the third largest digit in the third largest valued column.
Therefore, the $2$ will be placed in the tens column.
Next we place the fourth largest digit in the fourth largest valued column
Therefore, the $1$ will be placed in the ones column.
$9421$