Finding the Fourth Proportional to 90,395.28, 124,749.72 and 56,423.88

Step by Step Solution

1. Step 1: Write the proportion equation
   90,395.28 : 124,749.72 = 56,423.88 : x
2. Step 2: Convert to fraction form
   90,395.28/124,749.72 = 56,423.88/x
3. Step 3: Cross multiply
   90,395.28x = 124,749.72 × 56,423.88
4. Step 4: Simplify right side
   90,395.28x = 7,038,863,231.31
5. Step 5: Solve for x
   x = 7,038,863,231.31/90,395.28
6. Step 6: Final answer
   x = 77,867.60