Finding the Fourth Proportional to 90,466.86, 124,762.56 and 56,478.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,466.86 : 124,762.56 = 56,478.50 : x
2. Step 2: Convert to fraction form
   90,466.86/124,762.56 = 56,478.50/x
3. Step 3: Cross multiply
   90,466.86x = 124,762.56 × 56,478.50
4. Step 4: Simplify right side
   90,466.86x = 7,046,402,244.96
5. Step 5: Solve for x
   x = 7,046,402,244.96/90,466.86
6. Step 6: Final answer
   x = 77,889.32