Finding the Fourth Proportional to 86,018.27, 129,042.54 and 39,275.87

Step by Step Solution

1. Step 1: Write the proportion equation
   86,018.27 : 129,042.54 = 39,275.87 : x
2. Step 2: Convert to fraction form
   86,018.27/129,042.54 = 39,275.87/x
3. Step 3: Cross multiply
   86,018.27x = 129,042.54 × 39,275.87
4. Step 4: Simplify right side
   86,018.27x = 5,068,258,025.51
5. Step 5: Solve for x
   x = 5,068,258,025.51/86,018.27
6. Step 6: Final answer
   x = 58,920.72