Finding the Third Proportional to 12,399.75 and 16,878.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.75 : 16,878.38 = 16,878.38 : x
2. Step 2: Convert to fraction form
   12,399.75/16,878.38 = 16,878.38/x
3. Step 3: Cross multiply
   12,399.75x = 16,878.38 × 16,878.38
4. Step 4: Simplify right side
   12,399.75x = 284,879,542.64
5. Step 5: Solve for x
   x = 284,879,542.64/12,399.75
6. Step 6: Final answer
   x = 22,974.62