Finding the Fourth Proportional to 115,654.78, 159,596.21 and 64,671.71

Step by Step Solution

1. Step 1: Write the proportion equation
   115,654.78 : 159,596.21 = 64,671.71 : x
2. Step 2: Convert to fraction form
   115,654.78/159,596.21 = 64,671.71/x
3. Step 3: Cross multiply
   115,654.78x = 159,596.21 × 64,671.71
4. Step 4: Simplify right side
   115,654.78x = 10,321,359,486.86
5. Step 5: Solve for x
   x = 10,321,359,486.86/115,654.78
6. Step 6: Final answer
   x = 89,242.83