Finding the Third Proportional to 9,658 and 12,879

Step by Step Solution

1. Step 1: Write the proportion equation
   9,658 : 12,879 = 12,879 : x
2. Step 2: Convert to fraction form
   9,658/12,879 = 12,879/x
3. Step 3: Cross multiply
   9,658x = 12,879 × 12,879
4. Step 4: Simplify right side
   9,658x = 165,868,641
5. Step 5: Solve for x
   x = 165,868,641/9,658
6. Step 6: Final answer
   x = 17,174.22