Answer:
$411,184.
Explanation:
To find the principal amount for our given commercial loan we will use simple interest formula.

A= Amount after t years.
P= Principal amount.
r= Interest rate in decimal form.
t= Time 
First of all let us convert our given interest rate in decimal form.
 
 
Now let us substitute our given values in above formula.



 
 
 
 
Therefore, the principal amount is $411,184.