Finding the Third Proportional to 12,878 and 20,469

Step by Step Solution

1. Step 1: Write the proportion equation
   12,878 : 20,469 = 20,469 : x
2. Step 2: Convert to fraction form
   12,878/20,469 = 20,469/x
3. Step 3: Cross multiply
   12,878x = 20,469 × 20,469
4. Step 4: Simplify right side
   12,878x = 418,979,961
5. Step 5: Solve for x
   x = 418,979,961/12,878
6. Step 6: Final answer
   x = 32,534.55