Finding the Fourth Proportional to 123,609.24, 170,517.96 and 78,210.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123,609.24 : 170,517.96 = 78,210.72 : x
2. Step 2: Convert to fraction form
   123,609.24/170,517.96 = 78,210.72/x
3. Step 3: Cross multiply
   123,609.24x = 170,517.96 × 78,210.72
4. Step 4: Simplify right side
   123,609.24x = 13,336,332,424.53
5. Step 5: Solve for x
   x = 13,336,332,424.53/123,609.24
6. Step 6: Final answer
   x = 107,891.06