Finding the Fourth Proportional to 115,691.86, 159,654.31 and 64,704.39

Step by Step Solution

1. Step 1: Write the proportion equation
   115,691.86 : 159,654.31 = 64,704.39 : x
2. Step 2: Convert to fraction form
   115,691.86/159,654.31 = 64,704.39/x
3. Step 3: Cross multiply
   115,691.86x = 159,654.31 × 64,704.39
4. Step 4: Simplify right side
   115,691.86x = 10,330,333,978.96
5. Step 5: Solve for x
   x = 10,330,333,978.96/115,691.86
6. Step 6: Final answer
   x = 89,291.80