Finding the Fourth Proportional to 641,591.76, 885,385.89 and 355,105.71

Step by Step Solution

1. Step 1: Write the proportion equation
   641,591.76 : 885,385.89 = 355,105.71 : x
2. Step 2: Convert to fraction form
   641,591.76/885,385.89 = 355,105.71/x
3. Step 3: Cross multiply
   641,591.76x = 885,385.89 × 355,105.71
4. Step 4: Simplify right side
   641,591.76x = 314,405,585,092.43
5. Step 5: Solve for x
   x = 314,405,585,092.43/641,591.76
6. Step 6: Final answer
   x = 490,039.94