Finding the Third Proportional to 11,208 and 12,680

Step by Step Solution

1. Step 1: Write the proportion equation
   11,208 : 12,680 = 12,680 : x
2. Step 2: Convert to fraction form
   11,208/12,680 = 12,680/x
3. Step 3: Cross multiply
   11,208x = 12,680 × 12,680
4. Step 4: Simplify right side
   11,208x = 160,782,400
5. Step 5: Solve for x
   x = 160,782,400/11,208
6. Step 6: Final answer
   x = 14,345.32