Finding the Third Proportional to 9,159 and 12,864

Step by Step Solution

1. Step 1: Write the proportion equation
   9,159 : 12,864 = 12,864 : x
2. Step 2: Convert to fraction form
   9,159/12,864 = 12,864/x
3. Step 3: Cross multiply
   9,159x = 12,864 × 12,864
4. Step 4: Simplify right side
   9,159x = 165,482,496
5. Step 5: Solve for x
   x = 165,482,496/9,159
6. Step 6: Final answer
   x = 18,067.75