Finding the Third Proportional to 16,128 and 18,216

Step by Step Solution

1. Step 1: Write the proportion equation
   16,128 : 18,216 = 18,216 : x
2. Step 2: Convert to fraction form
   16,128/18,216 = 18,216/x
3. Step 3: Cross multiply
   16,128x = 18,216 × 18,216
4. Step 4: Simplify right side
   16,128x = 331,822,656
5. Step 5: Solve for x
   x = 331,822,656/16,128
6. Step 6: Final answer
   x = 20,574.32