Finding the Fourth Proportional to 115,679.38, 159,636.42 and 64,691.53

Step by Step Solution

1. Step 1: Write the proportion equation
   115,679.38 : 159,636.42 = 64,691.53 : x
2. Step 2: Convert to fraction form
   115,679.38/159,636.42 = 64,691.53/x
3. Step 3: Cross multiply
   115,679.38x = 159,636.42 × 64,691.53
4. Step 4: Simplify right side
   115,679.38x = 10,327,124,253.52
5. Step 5: Solve for x
   x = 10,327,124,253.52/115,679.38
6. Step 6: Final answer
   x = 89,273.68