Finding the Fourth Proportional to 115,714.71, 159,678 and 64,724.76

Step by Step Solution

1. Step 1: Write the proportion equation
   115,714.71 : 159,678 = 64,724.76 : x
2. Step 2: Convert to fraction form
   115,714.71/159,678 = 64,724.76/x
3. Step 3: Cross multiply
   115,714.71x = 159,678 × 64,724.76
4. Step 4: Simplify right side
   115,714.71x = 10,335,120,227.28
5. Step 5: Solve for x
   x = 10,335,120,227.28/115,714.71
6. Step 6: Final answer
   x = 89,315.53