Finding the Third Proportional to 9,720 and 21,600

Step by Step Solution

1. Step 1: Write the proportion equation
   9,720 : 21,600 = 21,600 : x
2. Step 2: Convert to fraction form
   9,720/21,600 = 21,600/x
3. Step 3: Cross multiply
   9,720x = 21,600 × 21,600
4. Step 4: Simplify right side
   9,720x = 466,560,000
5. Step 5: Solve for x
   x = 466,560,000/9,720
6. Step 6: Final answer
   x = 48,000