Finding the Third Proportional to 9,871 and 12,817

Step by Step Solution

1. Step 1: Write the proportion equation
   9,871 : 12,817 = 12,817 : x
2. Step 2: Convert to fraction form
   9,871/12,817 = 12,817/x
3. Step 3: Cross multiply
   9,871x = 12,817 × 12,817
4. Step 4: Simplify right side
   9,871x = 164,275,489
5. Step 5: Solve for x
   x = 164,275,489/9,871
6. Step 6: Final answer
   x = 16,642.23