Finding the Third Proportional to 12,600 and 16,380

Step by Step Solution

1. Step 1: Write the proportion equation
   12,600 : 16,380 = 16,380 : x
2. Step 2: Convert to fraction form
   12,600/16,380 = 16,380/x
3. Step 3: Cross multiply
   12,600x = 16,380 × 16,380
4. Step 4: Simplify right side
   12,600x = 268,304,400
5. Step 5: Solve for x
   x = 268,304,400/12,600
6. Step 6: Final answer
   x = 21,294