Finding the Third Proportional to 21,405 and 28,863

Step by Step Solution

1. Step 1: Write the proportion equation
   21,405 : 28,863 = 28,863 : x
2. Step 2: Convert to fraction form
   21,405/28,863 = 28,863/x
3. Step 3: Cross multiply
   21,405x = 28,863 × 28,863
4. Step 4: Simplify right side
   21,405x = 833,072,769
5. Step 5: Solve for x
   x = 833,072,769/21,405
6. Step 6: Final answer
   x = 38,919.54