Finding the Fourth Proportional to 86,513.10, 129,726.45 and 39,713.10

Step by Step Solution

1. Step 1: Write the proportion equation
   86,513.10 : 129,726.45 = 39,713.10 : x
2. Step 2: Convert to fraction form
   86,513.10/129,726.45 = 39,713.10/x
3. Step 3: Cross multiply
   86,513.10x = 129,726.45 × 39,713.10
4. Step 4: Simplify right side
   86,513.10x = 5,151,839,481.50
5. Step 5: Solve for x
   x = 5,151,839,481.50/86,513.10
6. Step 6: Final answer
   x = 59,549.82