Finding the Fourth Proportional to 86,663, 129,978.06 and 42,245.08

Step by Step Solution

1. Step 1: Write the proportion equation
   86,663 : 129,978.06 = 42,245.08 : x
2. Step 2: Convert to fraction form
   86,663/129,978.06 = 42,245.08/x
3. Step 3: Cross multiply
   86,663x = 129,978.06 × 42,245.08
4. Step 4: Simplify right side
   86,663x = 5,490,933,542.94
5. Step 5: Solve for x
   x = 5,490,933,542.94/86,663
6. Step 6: Final answer
   x = 63,359.61