Finding the Third Proportional to 9,960 and 10,872

Step by Step Solution

1. Step 1: Write the proportion equation
   9,960 : 10,872 = 10,872 : x
2. Step 2: Convert to fraction form
   9,960/10,872 = 10,872/x
3. Step 3: Cross multiply
   9,960x = 10,872 × 10,872
4. Step 4: Simplify right side
   9,960x = 118,200,384
5. Step 5: Solve for x
   x = 118,200,384/9,960
6. Step 6: Final answer
   x = 11,867.51