Finding the Third Proportional to 12,876 and 15,540

Step by Step Solution

1. Step 1: Write the proportion equation
   12,876 : 15,540 = 15,540 : x
2. Step 2: Convert to fraction form
   12,876/15,540 = 15,540/x
3. Step 3: Cross multiply
   12,876x = 15,540 × 15,540
4. Step 4: Simplify right side
   12,876x = 241,491,600
5. Step 5: Solve for x
   x = 241,491,600/12,876
6. Step 6: Final answer
   x = 18,755.17