Finding the Third Proportional to 8,387 and 12,993

Step by Step Solution

1. Step 1: Write the proportion equation
   8,387 : 12,993 = 12,993 : x
2. Step 2: Convert to fraction form
   8,387/12,993 = 12,993/x
3. Step 3: Cross multiply
   8,387x = 12,993 × 12,993
4. Step 4: Simplify right side
   8,387x = 168,818,049
5. Step 5: Solve for x
   x = 168,818,049/8,387
6. Step 6: Final answer
   x = 20,128.54