Finding the Fourth Proportional to 657,039.98, 906,716.50 and 355,233.98

Step by Step Solution

1. Step 1: Write the proportion equation
   657,039.98 : 906,716.50 = 355,233.98 : x
2. Step 2: Convert to fraction form
   657,039.98/906,716.50 = 355,233.98/x
3. Step 3: Cross multiply
   657,039.98x = 906,716.50 × 355,233.98
4. Step 4: Simplify right side
   657,039.98x = 322,096,511,026.67
5. Step 5: Solve for x
   x = 322,096,511,026.67/657,039.98
6. Step 6: Final answer
   x = 490,223.61