Finding the Fourth Proportional to 361,123.31, 539,313.59 and 290,153.75

Step by Step Solution

1. Step 1: Write the proportion equation
   361,123.31 : 539,313.59 = 290,153.75 : x
2. Step 2: Convert to fraction form
   361,123.31/539,313.59 = 290,153.75/x
3. Step 3: Cross multiply
   361,123.31x = 539,313.59 × 290,153.75
4. Step 4: Simplify right side
   361,123.31x = 156,483,858,593.28
5. Step 5: Solve for x
   x = 156,483,858,593.28/361,123.31
6. Step 6: Final answer
   x = 433,325.27