Answer
x=9050
Work Step by Step
Set the product of the means equal to the product of the extremes and solve for the variable.
$104 \times3210=36.9\times x$
$333840=36.9x$
$333840\div36.9=36.9\div36.9$
$x=90\underset\uparrow47.154$
Since the digit to the right of the 3rd significant digit is greater than 5, round up.
