Finding the Fourth Proportional to 716,962.38, 989,443.59 and 394,669.05

Step by Step Solution

1. Step 1: Write the proportion equation
   716,962.38 : 989,443.59 = 394,669.05 : x
2. Step 2: Convert to fraction form
   716,962.38/989,443.59 = 394,669.05/x
3. Step 3: Cross multiply
   716,962.38x = 989,443.59 × 394,669.05
4. Step 4: Simplify right side
   716,962.38x = 390,502,761,693.89
5. Step 5: Solve for x
   x = 390,502,761,693.89/716,962.38
6. Step 6: Final answer
   x = 544,662.83