Finding the Third Proportional to 12,872 and 17,240

Step by Step Solution

1. Step 1: Write the proportion equation
   12,872 : 17,240 = 17,240 : x
2. Step 2: Convert to fraction form
   12,872/17,240 = 17,240/x
3. Step 3: Cross multiply
   12,872x = 17,240 × 17,240
4. Step 4: Simplify right side
   12,872x = 297,217,600
5. Step 5: Solve for x
   x = 297,217,600/12,872
6. Step 6: Final answer
   x = 23,090.24