Finding the Fourth Proportional to 81,604.74, 122,308.68 and 42,140.34

Step by Step Solution

1. Step 1: Write the proportion equation
   81,604.74 : 122,308.68 = 42,140.34 : x
2. Step 2: Convert to fraction form
   81,604.74/122,308.68 = 42,140.34/x
3. Step 3: Cross multiply
   81,604.74x = 122,308.68 × 42,140.34
4. Step 4: Simplify right side
   81,604.74x = 5,154,129,360.15
5. Step 5: Solve for x
   x = 5,154,129,360.15/81,604.74
6. Step 6: Final answer
   x = 63,159.68