Finding the Third Proportional to 12,790 and 17,280

Step by Step Solution

1. Step 1: Write the proportion equation
   12,790 : 17,280 = 17,280 : x
2. Step 2: Convert to fraction form
   12,790/17,280 = 17,280/x
3. Step 3: Cross multiply
   12,790x = 17,280 × 17,280
4. Step 4: Simplify right side
   12,790x = 298,598,400
5. Step 5: Solve for x
   x = 298,598,400/12,790
6. Step 6: Final answer
   x = 23,346.24