Finding the Fourth Proportional to 81,780.10, 122,674.20 and 42,414.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,780.10 : 122,674.20 = 42,414.10 : x
2. Step 2: Convert to fraction form
   81,780.10/122,674.20 = 42,414.10/x
3. Step 3: Cross multiply
   81,780.10x = 122,674.20 × 42,414.10
4. Step 4: Simplify right side
   81,780.10x = 5,203,115,786.22
5. Step 5: Solve for x
   x = 5,203,115,786.22/81,780.10
6. Step 6: Final answer
   x = 63,623.25