Finding the Fourth Proportional to 309,239.78, 423,553.34 and 291,082.82

Step by Step Solution

1. Step 1: Write the proportion equation
   309,239.78 : 423,553.34 = 291,082.82 : x
2. Step 2: Convert to fraction form
   309,239.78/423,553.34 = 291,082.82/x
3. Step 3: Cross multiply
   309,239.78x = 423,553.34 × 291,082.82
4. Step 4: Simplify right side
   309,239.78x = 123,289,100,627.62
5. Step 5: Solve for x
   x = 123,289,100,627.62/309,239.78
6. Step 6: Final answer
   x = 398,684.48