Finding the Fourth Proportional to 115,706.17, 159,689.31 and 64,721.73

Step by Step Solution

1. Step 1: Write the proportion equation
   115,706.17 : 159,689.31 = 64,721.73 : x
2. Step 2: Convert to fraction form
   115,706.17/159,689.31 = 64,721.73/x
3. Step 3: Cross multiply
   115,706.17x = 159,689.31 × 64,721.73
4. Step 4: Simplify right side
   115,706.17x = 10,335,368,761.83
5. Step 5: Solve for x
   x = 10,335,368,761.83/115,706.17
6. Step 6: Final answer
   x = 89,324.27