Finding the Third Proportional to 8,684 and 12,736

Step by Step Solution

1. Step 1: Write the proportion equation
   8,684 : 12,736 = 12,736 : x
2. Step 2: Convert to fraction form
   8,684/12,736 = 12,736/x
3. Step 3: Cross multiply
   8,684x = 12,736 × 12,736
4. Step 4: Simplify right side
   8,684x = 162,205,696
5. Step 5: Solve for x
   x = 162,205,696/8,684
6. Step 6: Final answer
   x = 18,678.68