Finding the Third Proportional to 16,632 and 21,879

Step by Step Solution

1. Step 1: Write the proportion equation
   16,632 : 21,879 = 21,879 : x
2. Step 2: Convert to fraction form
   16,632/21,879 = 21,879/x
3. Step 3: Cross multiply
   16,632x = 21,879 × 21,879
4. Step 4: Simplify right side
   16,632x = 478,690,641
5. Step 5: Solve for x
   x = 478,690,641/16,632
6. Step 6: Final answer
   x = 28,781.30