Finding the Third Proportional to 9,920 and 13,179

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920 : 13,179 = 13,179 : x
2. Step 2: Convert to fraction form
   9,920/13,179 = 13,179/x
3. Step 3: Cross multiply
   9,920x = 13,179 × 13,179
4. Step 4: Simplify right side
   9,920x = 173,686,041
5. Step 5: Solve for x
   x = 173,686,041/9,920
6. Step 6: Final answer
   x = 17,508.67