Finding the Fourth Proportional to 90,359.28, 124,700.04 and 56,387.88

Step by Step Solution

1. Step 1: Write the proportion equation
   90,359.28 : 124,700.04 = 56,387.88 : x
2. Step 2: Convert to fraction form
   90,359.28/124,700.04 = 56,387.88/x
3. Step 3: Cross multiply
   90,359.28x = 124,700.04 × 56,387.88
4. Step 4: Simplify right side
   90,359.28x = 7,031,570,891.52
5. Step 5: Solve for x
   x = 7,031,570,891.52/90,359.28
6. Step 6: Final answer
   x = 77,817.92