Finding the Third Proportional to 13,404 and 20,451

Step by Step Solution

1. Step 1: Write the proportion equation
   13,404 : 20,451 = 20,451 : x
2. Step 2: Convert to fraction form
   13,404/20,451 = 20,451/x
3. Step 3: Cross multiply
   13,404x = 20,451 × 20,451
4. Step 4: Simplify right side
   13,404x = 418,243,401
5. Step 5: Solve for x
   x = 418,243,401/13,404
6. Step 6: Final answer
   x = 31,202.88