Finding the Third Proportional to 13,008 and 16,680

Step by Step Solution

1. Step 1: Write the proportion equation
   13,008 : 16,680 = 16,680 : x
2. Step 2: Convert to fraction form
   13,008/16,680 = 16,680/x
3. Step 3: Cross multiply
   13,008x = 16,680 × 16,680
4. Step 4: Simplify right side
   13,008x = 278,222,400
5. Step 5: Solve for x
   x = 278,222,400/13,008
6. Step 6: Final answer
   x = 21,388.56