Finding the Third Proportional to 16,431 and 18,105

Step by Step Solution

1. Step 1: Write the proportion equation
   16,431 : 18,105 = 18,105 : x
2. Step 2: Convert to fraction form
   16,431/18,105 = 18,105/x
3. Step 3: Cross multiply
   16,431x = 18,105 × 18,105
4. Step 4: Simplify right side
   16,431x = 327,791,025
5. Step 5: Solve for x
   x = 327,791,025/16,431
6. Step 6: Final answer
   x = 19,949.55