Finding the Third Proportional to 12,940.13 and 18,217.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940.13 : 18,217.69 = 18,217.69 : x
2. Step 2: Convert to fraction form
   12,940.13/18,217.69 = 18,217.69/x
3. Step 3: Cross multiply
   12,940.13x = 18,217.69 × 18,217.69
4. Step 4: Simplify right side
   12,940.13x = 331,884,137.85
5. Step 5: Solve for x
   x = 331,884,137.85/12,940.13
6. Step 6: Final answer
   x = 25,647.68