Finding the Fourth Proportional to 642,383.56, 886,463.86 and 355,908.04

Step by Step Solution

1. Step 1: Write the proportion equation
   642,383.56 : 886,463.86 = 355,908.04 : x
2. Step 2: Convert to fraction form
   642,383.56/886,463.86 = 355,908.04/x
3. Step 3: Cross multiply
   642,383.56x = 886,463.86 × 355,908.04
4. Step 4: Simplify right side
   642,383.56x = 315,499,614,943.43
5. Step 5: Solve for x
   x = 315,499,614,943.43/642,383.56
6. Step 6: Final answer
   x = 491,138.99