Finding the Fourth Proportional to 123,469.50, 170,426.79 and 78,757.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,469.50 : 170,426.79 = 78,757.50 : x
2. Step 2: Convert to fraction form
   123,469.50/170,426.79 = 78,757.50/x
3. Step 3: Cross multiply
   123,469.50x = 170,426.79 × 78,757.50
4. Step 4: Simplify right side
   123,469.50x = 13,422,387,913.43
5. Step 5: Solve for x
   x = 13,422,387,913.43/123,469.50
6. Step 6: Final answer
   x = 108,710.15