Finding the Fourth Proportional to 81,766.10, 122,653.20 and 42,400.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,766.10 : 122,653.20 = 42,400.10 : x
2. Step 2: Convert to fraction form
   81,766.10/122,653.20 = 42,400.10/x
3. Step 3: Cross multiply
   81,766.10x = 122,653.20 × 42,400.10
4. Step 4: Simplify right side
   81,766.10x = 5,200,507,945.32
5. Step 5: Solve for x
   x = 5,200,507,945.32/81,766.10
6. Step 6: Final answer
   x = 63,602.25