Finding the Third Proportional to 56,815.50 and 123,999

Step by Step Solution

1. Step 1: Write the proportion equation
   56,815.50 : 123,999 = 123,999 : x
2. Step 2: Convert to fraction form
   56,815.50/123,999 = 123,999/x
3. Step 3: Cross multiply
   56,815.50x = 123,999 × 123,999
4. Step 4: Simplify right side
   56,815.50x = 15,375,752,001
5. Step 5: Solve for x
   x = 15,375,752,001/56,815.50
6. Step 6: Final answer
   x = 270,626.01