Finding the Fourth Proportional to 81,764.10, 122,650.20 and 42,398.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,764.10 : 122,650.20 = 42,398.10 : x
2. Step 2: Convert to fraction form
   81,764.10/122,650.20 = 42,398.10/x
3. Step 3: Cross multiply
   81,764.10x = 122,650.20 × 42,398.10
4. Step 4: Simplify right side
   81,764.10x = 5,200,135,444.62
5. Step 5: Solve for x
   x = 5,200,135,444.62/81,764.10
6. Step 6: Final answer
   x = 63,599.25