Answer
$228,000
Work Step by Step
Create a proportion using ratios of price:sq ft.
$\frac{\$171,000}{1800\ ft^2}=\frac{\$x}{2400\ ft^2}$
Set the product of the means equal to the product of the extremes and solve for the variable.
$1800 \times x=171,000\times 2400$
$1800x=410,400,000$
$1800x\div1800=410,400,000\div1800$
$x=228,000$