Finding the Third Proportional to 12,717 and 18,118.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,717 : 18,118.69 = 18,118.69 : x
2. Step 2: Convert to fraction form
   12,717/18,118.69 = 18,118.69/x
3. Step 3: Cross multiply
   12,717x = 18,118.69 × 18,118.69
4. Step 4: Simplify right side
   12,717x = 328,286,836.72
5. Step 5: Solve for x
   x = 328,286,836.72/12,717
6. Step 6: Final answer
   x = 25,814.80