Finding the Fourth Proportional to 657,291, 907,061.58 and 355,485

Step by Step Solution

1. Step 1: Write the proportion equation
   657,291 : 907,061.58 = 355,485 : x
2. Step 2: Convert to fraction form
   657,291/907,061.58 = 355,485/x
3. Step 3: Cross multiply
   657,291x = 907,061.58 × 355,485
4. Step 4: Simplify right side
   657,291x = 322,446,785,766.30
5. Step 5: Solve for x
   x = 322,446,785,766.30/657,291
6. Step 6: Final answer
   x = 490,569.30