Finding the Third Proportional to 13,920 and 17,640

Step by Step Solution

1. Step 1: Write the proportion equation
   13,920 : 17,640 = 17,640 : x
2. Step 2: Convert to fraction form
   13,920/17,640 = 17,640/x
3. Step 3: Cross multiply
   13,920x = 17,640 × 17,640
4. Step 4: Simplify right side
   13,920x = 311,169,600
5. Step 5: Solve for x
   x = 311,169,600/13,920
6. Step 6: Final answer
   x = 22,354.14