Finding the Fourth Proportional to 123,531.78, 170,425.16 and 80,561.33

Step by Step Solution

1. Step 1: Write the proportion equation
   123,531.78 : 170,425.16 = 80,561.33 : x
2. Step 2: Convert to fraction form
   123,531.78/170,425.16 = 80,561.33/x
3. Step 3: Cross multiply
   123,531.78x = 170,425.16 × 80,561.33
4. Step 4: Simplify right side
   123,531.78x = 13,729,678,653.13
5. Step 5: Solve for x
   x = 13,729,678,653.13/123,531.78
6. Step 6: Final answer
   x = 111,142.88