Finding the Third Proportional to 20,420 and 30,608

Step by Step Solution

1. Step 1: Write the proportion equation
   20,420 : 30,608 = 30,608 : x
2. Step 2: Convert to fraction form
   20,420/30,608 = 30,608/x
3. Step 3: Cross multiply
   20,420x = 30,608 × 30,608
4. Step 4: Simplify right side
   20,420x = 936,849,664
5. Step 5: Solve for x
   x = 936,849,664/20,420
6. Step 6: Final answer
   x = 45,879.02