Finding the Fourth Proportional to 115,800.40, 159,807.42 and 64,812.72

Step by Step Solution

1. Step 1: Write the proportion equation
   115,800.40 : 159,807.42 = 64,812.72 : x
2. Step 2: Convert to fraction form
   115,800.40/159,807.42 = 64,812.72/x
3. Step 3: Cross multiply
   115,800.40x = 159,807.42 × 64,812.72
4. Step 4: Simplify right side
   115,800.40x = 10,357,553,566.38
5. Step 5: Solve for x
   x = 10,357,553,566.38/115,800.40
6. Step 6: Final answer
   x = 89,443.16