Finding the Fourth Proportional to 657,139.86, 906,854.00 and 355,333.86

Step by Step Solution

1. Step 1: Write the proportion equation
   657,139.86 : 906,854.00 = 355,333.86 : x
2. Step 2: Convert to fraction form
   657,139.86/906,854.00 = 355,333.86/x
3. Step 3: Cross multiply
   657,139.86x = 906,854.00 × 355,333.86
4. Step 4: Simplify right side
   657,139.86x = 322,235,930,499.77
5. Step 5: Solve for x
   x = 322,235,930,499.77/657,139.86
6. Step 6: Final answer
   x = 490,361.26