Finding the Third Proportional to 8,222 and 12,861

Step by Step Solution

1. Step 1: Write the proportion equation
   8,222 : 12,861 = 12,861 : x
2. Step 2: Convert to fraction form
   8,222/12,861 = 12,861/x
3. Step 3: Cross multiply
   8,222x = 12,861 × 12,861
4. Step 4: Simplify right side
   8,222x = 165,405,321
5. Step 5: Solve for x
   x = 165,405,321/8,222
6. Step 6: Final answer
   x = 20,117.41