Finding the Third Proportional to 9,612 and 12,780

Step by Step Solution

1. Step 1: Write the proportion equation
   9,612 : 12,780 = 12,780 : x
2. Step 2: Convert to fraction form
   9,612/12,780 = 12,780/x
3. Step 3: Cross multiply
   9,612x = 12,780 × 12,780
4. Step 4: Simplify right side
   9,612x = 163,328,400
5. Step 5: Solve for x
   x = 163,328,400/9,612
6. Step 6: Final answer
   x = 16,992.13