Finding the Fourth Proportional to 81,613.52, 122,321.76 and 42,149.12

Step by Step Solution

1. Step 1: Write the proportion equation
   81,613.52 : 122,321.76 = 42,149.12 : x
2. Step 2: Convert to fraction form
   81,613.52/122,321.76 = 42,149.12/x
3. Step 3: Cross multiply
   81,613.52x = 122,321.76 × 42,149.12
4. Step 4: Simplify right side
   81,613.52x = 5,155,754,540.85
5. Step 5: Solve for x
   x = 5,155,754,540.85/81,613.52
6. Step 6: Final answer
   x = 63,172.80