Finding the Fourth Proportional to 81,446.10, 122,165.10 and 42,007.20

Step by Step Solution

1. Step 1: Write the proportion equation
   81,446.10 : 122,165.10 = 42,007.20 : x
2. Step 2: Convert to fraction form
   81,446.10/122,165.10 = 42,007.20/x
3. Step 3: Cross multiply
   81,446.10x = 122,165.10 × 42,007.20
4. Step 4: Simplify right side
   81,446.10x = 5,131,813,788.72
5. Step 5: Solve for x
   x = 5,131,813,788.72/81,446.10
6. Step 6: Final answer
   x = 63,008.71