Finding the Fourth Proportional to 431,719.72, 648,139.78 and 331,949.69

Step by Step Solution

1. Step 1: Write the proportion equation
   431,719.72 : 648,139.78 = 331,949.69 : x
2. Step 2: Convert to fraction form
   431,719.72/648,139.78 = 331,949.69/x
3. Step 3: Cross multiply
   431,719.72x = 648,139.78 × 331,949.69
4. Step 4: Simplify right side
   431,719.72x = 215,149,800,431.00
5. Step 5: Solve for x
   x = 215,149,800,431.00/431,719.72
6. Step 6: Final answer
   x = 498,355.27