Finding the Third Proportional to 12,864 and 17,920

Step by Step Solution

1. Step 1: Write the proportion equation
   12,864 : 17,920 = 17,920 : x
2. Step 2: Convert to fraction form
   12,864/17,920 = 17,920/x
3. Step 3: Cross multiply
   12,864x = 17,920 × 17,920
4. Step 4: Simplify right side
   12,864x = 321,126,400
5. Step 5: Solve for x
   x = 321,126,400/12,864
6. Step 6: Final answer
   x = 24,963.18