Finding the Third Proportional to 21,135 and 28,469

Step by Step Solution

1. Step 1: Write the proportion equation
   21,135 : 28,469 = 28,469 : x
2. Step 2: Convert to fraction form
   21,135/28,469 = 28,469/x
3. Step 3: Cross multiply
   21,135x = 28,469 × 28,469
4. Step 4: Simplify right side
   21,135x = 810,483,961
5. Step 5: Solve for x
   x = 810,483,961/21,135
6. Step 6: Final answer
   x = 38,347.95