Finding the Third Proportional to 21,480 and 28,872

Step by Step Solution

1. Step 1: Write the proportion equation
   21,480 : 28,872 = 28,872 : x
2. Step 2: Convert to fraction form
   21,480/28,872 = 28,872/x
3. Step 3: Cross multiply
   21,480x = 28,872 × 28,872
4. Step 4: Simplify right side
   21,480x = 833,592,384
5. Step 5: Solve for x
   x = 833,592,384/21,480
6. Step 6: Final answer
   x = 38,807.84