Finding the Third Proportional to 9,720 and 13,392

Step by Step Solution

1. Step 1: Write the proportion equation
   9,720 : 13,392 = 13,392 : x
2. Step 2: Convert to fraction form
   9,720/13,392 = 13,392/x
3. Step 3: Cross multiply
   9,720x = 13,392 × 13,392
4. Step 4: Simplify right side
   9,720x = 179,345,664
5. Step 5: Solve for x
   x = 179,345,664/9,720
6. Step 6: Final answer
   x = 18,451.20