Finding the Fourth Proportional to 90,289.12, 124,660.56 and 56,310.88

Step by Step Solution

1. Step 1: Write the proportion equation
   90,289.12 : 124,660.56 = 56,310.88 : x
2. Step 2: Convert to fraction form
   90,289.12/124,660.56 = 56,310.88/x
3. Step 3: Cross multiply
   90,289.12x = 124,660.56 × 56,310.88
4. Step 4: Simplify right side
   90,289.12x = 7,019,745,834.89
5. Step 5: Solve for x
   x = 7,019,745,834.89/90,289.12
6. Step 6: Final answer
   x = 77,747.42