Finding the Third Proportional to 8,680 and 10,480

Step by Step Solution

1. Step 1: Write the proportion equation
   8,680 : 10,480 = 10,480 : x
2. Step 2: Convert to fraction form
   8,680/10,480 = 10,480/x
3. Step 3: Cross multiply
   8,680x = 10,480 × 10,480
4. Step 4: Simplify right side
   8,680x = 109,830,400
5. Step 5: Solve for x
   x = 109,830,400/8,680
6. Step 6: Final answer
   x = 12,653.27