Finding the Fourth Proportional to 709,165,854, 978,638,662.71 and 391,639,535.37

Step by Step Solution

1. Step 1: Write the proportion equation
   709,165,854 : 978,638,662.71 = 391,639,535.37 : x
2. Step 2: Convert to fraction form
   709,165,854/978,638,662.71 = 391,639,535.37/x
3. Step 3: Cross multiply
   709,165,854x = 978,638,662.71 × 391,639,535.37
4. Step 4: Simplify right side
   709,165,854x = 383,273,591,158,862,592
5. Step 5: Solve for x
   x = 383,273,591,158,862,592/709,165,854
6. Step 6: Final answer
   x = 540,456,917.09