Finding the Fourth Proportional to 123,220.05, 169,965.37 and 80,781.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123,220.05 : 169,965.37 = 80,781.31 : x
2. Step 2: Convert to fraction form
   123,220.05/169,965.37 = 80,781.31/x
3. Step 3: Cross multiply
   123,220.05x = 169,965.37 × 80,781.31
4. Step 4: Simplify right side
   123,220.05x = 13,730,025,041.28
5. Step 5: Solve for x
   x = 13,730,025,041.28/123,220.05
6. Step 6: Final answer
   x = 111,426.88