Finding the Fourth Proportional to 431,377.89, 647,068.50 and 131,857.31

Step by Step Solution

1. Step 1: Write the proportion equation
   431,377.89 : 647,068.50 = 131,857.31 : x
2. Step 2: Convert to fraction form
   431,377.89/647,068.50 = 131,857.31/x
3. Step 3: Cross multiply
   431,377.89x = 647,068.50 × 131,857.31
4. Step 4: Simplify right side
   431,377.89x = 85,320,708,560.39
5. Step 5: Solve for x
   x = 85,320,708,560.39/431,377.89
6. Step 6: Final answer
   x = 197,786.47