Finding the Third Proportional to 7,120 and 10,680

Step by Step Solution

1. Step 1: Write the proportion equation
   7,120 : 10,680 = 10,680 : x
2. Step 2: Convert to fraction form
   7,120/10,680 = 10,680/x
3. Step 3: Cross multiply
   7,120x = 10,680 × 10,680
4. Step 4: Simplify right side
   7,120x = 114,062,400
5. Step 5: Solve for x
   x = 114,062,400/7,120
6. Step 6: Final answer
   x = 16,020