Finding the Third Proportional to 8,456 and 12,684

Step by Step Solution

1. Step 1: Write the proportion equation
   8,456 : 12,684 = 12,684 : x
2. Step 2: Convert to fraction form
   8,456/12,684 = 12,684/x
3. Step 3: Cross multiply
   8,456x = 12,684 × 12,684
4. Step 4: Simplify right side
   8,456x = 160,883,856
5. Step 5: Solve for x
   x = 160,883,856/8,456
6. Step 6: Final answer
   x = 19,026