Finding the Third Proportional to 9,816 and 16,680

Step by Step Solution

1. Step 1: Write the proportion equation
   9,816 : 16,680 = 16,680 : x
2. Step 2: Convert to fraction form
   9,816/16,680 = 16,680/x
3. Step 3: Cross multiply
   9,816x = 16,680 × 16,680
4. Step 4: Simplify right side
   9,816x = 278,222,400
5. Step 5: Solve for x
   x = 278,222,400/9,816
6. Step 6: Final answer
   x = 28,343.77