Finding the Fourth Proportional to 86,665, 129,981.06 and 42,247.08

Step by Step Solution

1. Step 1: Write the proportion equation
   86,665 : 129,981.06 = 42,247.08 : x
2. Step 2: Convert to fraction form
   86,665/129,981.06 = 42,247.08/x
3. Step 3: Cross multiply
   86,665x = 129,981.06 × 42,247.08
4. Step 4: Simplify right side
   86,665x = 5,491,320,240.30
5. Step 5: Solve for x
   x = 5,491,320,240.30/86,665
6. Step 6: Final answer
   x = 63,362.61