Finding the Third Proportional to 20,421 and 30,630

Step by Step Solution

1. Step 1: Write the proportion equation
   20,421 : 30,630 = 30,630 : x
2. Step 2: Convert to fraction form
   20,421/30,630 = 30,630/x
3. Step 3: Cross multiply
   20,421x = 30,630 × 30,630
4. Step 4: Simplify right side
   20,421x = 938,196,900
5. Step 5: Solve for x
   x = 938,196,900/20,421
6. Step 6: Final answer
   x = 45,942.75