Finding the Fourth Proportional to 948,333.20, 1,308,819.38 and 621,920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   948,333.20 : 1,308,819.38 = 621,920.72 : x
2. Step 2: Convert to fraction form
   948,333.20/1,308,819.38 = 621,920.72/x
3. Step 3: Cross multiply
   948,333.20x = 1,308,819.38 × 621,920.72
4. Step 4: Simplify right side
   948,333.20x = 813,981,890,356.08
5. Step 5: Solve for x
   x = 813,981,890,356.08/948,333.20
6. Step 6: Final answer
   x = 858,329.00