Finding the Third Proportional to 9,840 and 10,680

Step by Step Solution

1. Step 1: Write the proportion equation
   9,840 : 10,680 = 10,680 : x
2. Step 2: Convert to fraction form
   9,840/10,680 = 10,680/x
3. Step 3: Cross multiply
   9,840x = 10,680 × 10,680
4. Step 4: Simplify right side
   9,840x = 114,062,400
5. Step 5: Solve for x
   x = 114,062,400/9,840
6. Step 6: Final answer
   x = 11,591.71