Finding the Fourth Proportional to 309,237.78, 423,550.61 and 291,080.82

Step by Step Solution

1. Step 1: Write the proportion equation
   309,237.78 : 423,550.61 = 291,080.82 : x
2. Step 2: Convert to fraction form
   309,237.78/423,550.61 = 291,080.82/x
3. Step 3: Cross multiply
   309,237.78x = 423,550.61 × 291,080.82
4. Step 4: Simplify right side
   309,237.78x = 123,287,457,414.90
5. Step 5: Solve for x
   x = 123,287,457,414.90/309,237.78
6. Step 6: Final answer
   x = 398,681.74