Finding the Fourth Proportional to 81,519.70, 122,218.80 and 42,105.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,519.70 : 122,218.80 = 42,105.10 : x
2. Step 2: Convert to fraction form
   81,519.70/122,218.80 = 42,105.10/x
3. Step 3: Cross multiply
   81,519.70x = 122,218.80 × 42,105.10
4. Step 4: Simplify right side
   81,519.70x = 5,146,034,795.88
5. Step 5: Solve for x
   x = 5,146,034,795.88/81,519.70
6. Step 6: Final answer
   x = 63,126.27