Finding the Fourth Proportional to 123,540.24, 170,422.68 and 78,141.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123,540.24 : 170,422.68 = 78,141.60 : x
2. Step 2: Convert to fraction form
   123,540.24/170,422.68 = 78,141.60/x
3. Step 3: Cross multiply
   123,540.24x = 170,422.68 × 78,141.60
4. Step 4: Simplify right side
   123,540.24x = 13,317,100,891.49
5. Step 5: Solve for x
   x = 13,317,100,891.49/123,540.24
6. Step 6: Final answer
   x = 107,795.65