Finding the Third Proportional to 10,986 and 12,009

Step by Step Solution

1. Step 1: Write the proportion equation
   10,986 : 12,009 = 12,009 : x
2. Step 2: Convert to fraction form
   10,986/12,009 = 12,009/x
3. Step 3: Cross multiply
   10,986x = 12,009 × 12,009
4. Step 4: Simplify right side
   10,986x = 144,216,081
5. Step 5: Solve for x
   x = 144,216,081/10,986
6. Step 6: Final answer
   x = 13,127.26