Finding the Fourth Proportional to 90,499.62, 124,446.60 and 78,542.20

Step by Step Solution

1. Step 1: Write the proportion equation
   90,499.62 : 124,446.60 = 78,542.20 : x
2. Step 2: Convert to fraction form
   90,499.62/124,446.60 = 78,542.20/x
3. Step 3: Cross multiply
   90,499.62x = 124,446.60 × 78,542.20
4. Step 4: Simplify right side
   90,499.62x = 9,774,309,124.29
5. Step 5: Solve for x
   x = 9,774,309,124.29/90,499.62
6. Step 6: Final answer
   x = 108,003.88