Finding the Third Proportional to 21,257 and 28,570

Step by Step Solution

1. Step 1: Write the proportion equation
   21,257 : 28,570 = 28,570 : x
2. Step 2: Convert to fraction form
   21,257/28,570 = 28,570/x
3. Step 3: Cross multiply
   21,257x = 28,570 × 28,570
4. Step 4: Simplify right side
   21,257x = 816,244,900
5. Step 5: Solve for x
   x = 816,244,900/21,257
6. Step 6: Final answer
   x = 38,398.88