Finding the Fourth Proportional to 431,314.32, 647,087.96 and 131,786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   431,314.32 : 647,087.96 = 131,786.72 : x
2. Step 2: Convert to fraction form
   431,314.32/647,087.96 = 131,786.72/x
3. Step 3: Cross multiply
   431,314.32x = 647,087.96 × 131,786.72
4. Step 4: Simplify right side
   431,314.32x = 85,277,599,799.89
5. Step 5: Solve for x
   x = 85,277,599,799.89/431,314.32
6. Step 6: Final answer
   x = 197,715.67