Finding the Third Proportional to 12,720 and 17,136

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720 : 17,136 = 17,136 : x
2. Step 2: Convert to fraction form
   12,720/17,136 = 17,136/x
3. Step 3: Cross multiply
   12,720x = 17,136 × 17,136
4. Step 4: Simplify right side
   12,720x = 293,642,496
5. Step 5: Solve for x
   x = 293,642,496/12,720
6. Step 6: Final answer
   x = 23,085.10