Finding the Third Proportional to 16,320 and 21,708

Step by Step Solution

1. Step 1: Write the proportion equation
   16,320 : 21,708 = 21,708 : x
2. Step 2: Convert to fraction form
   16,320/21,708 = 21,708/x
3. Step 3: Cross multiply
   16,320x = 21,708 × 21,708
4. Step 4: Simplify right side
   16,320x = 471,237,264
5. Step 5: Solve for x
   x = 471,237,264/16,320
6. Step 6: Final answer
   x = 28,874.83