Finding the Third Proportional to 12,132 and 16,218

Step by Step Solution

1. Step 1: Write the proportion equation
   12,132 : 16,218 = 16,218 : x
2. Step 2: Convert to fraction form
   12,132/16,218 = 16,218/x
3. Step 3: Cross multiply
   12,132x = 16,218 × 16,218
4. Step 4: Simplify right side
   12,132x = 263,023,524
5. Step 5: Solve for x
   x = 263,023,524/12,132
6. Step 6: Final answer
   x = 21,680.15