Finding the Fourth Proportional to 81,940.10, 122,910.15 and 42,574.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,940.10 : 122,910.15 = 42,574.10 : x
2. Step 2: Convert to fraction form
   81,940.10/122,910.15 = 42,574.10/x
3. Step 3: Cross multiply
   81,940.10x = 122,910.15 × 42,574.10
4. Step 4: Simplify right side
   81,940.10x = 5,232,789,017.12
5. Step 5: Solve for x
   x = 5,232,789,017.12/81,940.10
6. Step 6: Final answer
   x = 63,861.15