Finding the Third Proportional to 12,702 and 15,510

Step by Step Solution

1. Step 1: Write the proportion equation
   12,702 : 15,510 = 15,510 : x
2. Step 2: Convert to fraction form
   12,702/15,510 = 15,510/x
3. Step 3: Cross multiply
   12,702x = 15,510 × 15,510
4. Step 4: Simplify right side
   12,702x = 240,560,100
5. Step 5: Solve for x
   x = 240,560,100/12,702
6. Step 6: Final answer
   x = 18,938.76