Finding the Third Proportional to 8,710 and 12,860

Step by Step Solution

1. Step 1: Write the proportion equation
   8,710 : 12,860 = 12,860 : x
2. Step 2: Convert to fraction form
   8,710/12,860 = 12,860/x
3. Step 3: Cross multiply
   8,710x = 12,860 × 12,860
4. Step 4: Simplify right side
   8,710x = 165,379,600
5. Step 5: Solve for x
   x = 165,379,600/8,710
6. Step 6: Final answer
   x = 18,987.32