Below are actual sales data $($in millions$)$ for the past six months at a large retail store.

Month Sales $($in millions of dollars$)$

May $40$

June $38$

July $41$

August $44$

September $42$

October $43$

In retrospect, what would the $4-$month moving average forecast for September have been $($in millions of dollars$)?$

$40\mathrm{.}75$

$41\mathrm{.}25$

$41\mathrm{.}33$

$42\mathrm{.}00$