Finding the Fourth Proportional to 86,491.14, 129,752.38 and 39,128.52

Step by Step Solution

1. Step 1: Write the proportion equation
   86,491.14 : 129,752.38 = 39,128.52 : x
2. Step 2: Convert to fraction form
   86,491.14/129,752.38 = 39,128.52/x
3. Step 3: Cross multiply
   86,491.14x = 129,752.38 × 39,128.52
4. Step 4: Simplify right side
   86,491.14x = 5,077,018,401.50
5. Step 5: Solve for x
   x = 5,077,018,401.50/86,491.14
6. Step 6: Final answer
   x = 58,699.87