Finding the Third Proportional to 21,402 and 28,398

Step by Step Solution

1. Step 1: Write the proportion equation
   21,402 : 28,398 = 28,398 : x
2. Step 2: Convert to fraction form
   21,402/28,398 = 28,398/x
3. Step 3: Cross multiply
   21,402x = 28,398 × 28,398
4. Step 4: Simplify right side
   21,402x = 806,446,404
5. Step 5: Solve for x
   x = 806,446,404/21,402
6. Step 6: Final answer
   x = 37,680.89