Finding the Fourth Proportional to 86,401.63, 129,500.61 and 38,961.17

Step by Step Solution

1. Step 1: Write the proportion equation
   86,401.63 : 129,500.61 = 38,961.17 : x
2. Step 2: Convert to fraction form
   86,401.63/129,500.61 = 38,961.17/x
3. Step 3: Cross multiply
   86,401.63x = 129,500.61 × 38,961.17
4. Step 4: Simplify right side
   86,401.63x = 5,045,495,281.31
5. Step 5: Solve for x
   x = 5,045,495,281.31/86,401.63
6. Step 6: Final answer
   x = 58,395.83