Finding the Fourth Proportional to 81,442.10, 122,159.10 and 42,003.20

Step by Step Solution

1. Step 1: Write the proportion equation
   81,442.10 : 122,159.10 = 42,003.20 : x
2. Step 2: Convert to fraction form
   81,442.10/122,159.10 = 42,003.20/x
3. Step 3: Cross multiply
   81,442.10x = 122,159.10 × 42,003.20
4. Step 4: Simplify right side
   81,442.10x = 5,131,073,109.12
5. Step 5: Solve for x
   x = 5,131,073,109.12/81,442.10
6. Step 6: Final answer
   x = 63,002.71