Finding the Fourth Proportional to 85,679.31, 128,494.31 and 29,517.15

Step by Step Solution

1. Step 1: Write the proportion equation
   85,679.31 : 128,494.31 = 29,517.15 : x
2. Step 2: Convert to fraction form
   85,679.31/128,494.31 = 29,517.15/x
3. Step 3: Cross multiply
   85,679.31x = 128,494.31 × 29,517.15
4. Step 4: Simplify right side
   85,679.31x = 3,792,785,674.83
5. Step 5: Solve for x
   x = 3,792,785,674.83/85,679.31
6. Step 6: Final answer
   x = 44,267.23