Finding the Third Proportional to 8,628 and 12,986

Step by Step Solution

1. Step 1: Write the proportion equation
   8,628 : 12,986 = 12,986 : x
2. Step 2: Convert to fraction form
   8,628/12,986 = 12,986/x
3. Step 3: Cross multiply
   8,628x = 12,986 × 12,986
4. Step 4: Simplify right side
   8,628x = 168,636,196
5. Step 5: Solve for x
   x = 168,636,196/8,628
6. Step 6: Final answer
   x = 19,545.22