Finding the Third Proportional to 9,456 and 12,720

Step by Step Solution

1. Step 1: Write the proportion equation
   9,456 : 12,720 = 12,720 : x
2. Step 2: Convert to fraction form
   9,456/12,720 = 12,720/x
3. Step 3: Cross multiply
   9,456x = 12,720 × 12,720
4. Step 4: Simplify right side
   9,456x = 161,798,400
5. Step 5: Solve for x
   x = 161,798,400/9,456
6. Step 6: Final answer
   x = 17,110.66