Finding the Third Proportional to 12,156 and 16,911

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156 : 16,911 = 16,911 : x
2. Step 2: Convert to fraction form
   12,156/16,911 = 16,911/x
3. Step 3: Cross multiply
   12,156x = 16,911 × 16,911
4. Step 4: Simplify right side
   12,156x = 285,981,921
5. Step 5: Solve for x
   x = 285,981,921/12,156
6. Step 6: Final answer
   x = 23,525.99