Finding the Fourth Proportional to 123,517.86, 170,391.78 and 78,119.52

Step by Step Solution

1. Step 1: Write the proportion equation
   123,517.86 : 170,391.78 = 78,119.52 : x
2. Step 2: Convert to fraction form
   123,517.86/170,391.78 = 78,119.52/x
3. Step 3: Cross multiply
   123,517.86x = 170,391.78 × 78,119.52
4. Step 4: Simplify right side
   123,517.86x = 13,310,924,065.55
5. Step 5: Solve for x
   x = 13,310,924,065.55/123,517.86
6. Step 6: Final answer
   x = 107,765.18