Finding the Third Proportional to 21,456 and 28,647

Step by Step Solution

1. Step 1: Write the proportion equation
   21,456 : 28,647 = 28,647 : x
2. Step 2: Convert to fraction form
   21,456/28,647 = 28,647/x
3. Step 3: Cross multiply
   21,456x = 28,647 × 28,647
4. Step 4: Simplify right side
   21,456x = 820,650,609
5. Step 5: Solve for x
   x = 820,650,609/21,456
6. Step 6: Final answer
   x = 38,248.07