Finding the Fourth Proportional to 86,531.69, 129,705.20 and 39,141.83

Step by Step Solution

1. Step 1: Write the proportion equation
   86,531.69 : 129,705.20 = 39,141.83 : x
2. Step 2: Convert to fraction form
   86,531.69/129,705.20 = 39,141.83/x
3. Step 3: Cross multiply
   86,531.69x = 129,705.20 × 39,141.83
4. Step 4: Simplify right side
   86,531.69x = 5,076,899,163.85
5. Step 5: Solve for x
   x = 5,076,899,163.85/86,531.69
6. Step 6: Final answer
   x = 58,670.98