Finding the Third Proportional to 20,408 and 42,661

Step by Step Solution

1. Step 1: Write the proportion equation
   20,408 : 42,661 = 42,661 : x
2. Step 2: Convert to fraction form
   20,408/42,661 = 42,661/x
3. Step 3: Cross multiply
   20,408x = 42,661 × 42,661
4. Step 4: Simplify right side
   20,408x = 1,819,960,921
5. Step 5: Solve for x
   x = 1,819,960,921/20,408
6. Step 6: Final answer
   x = 89,178.80