Finding the Third Proportional to 20,425 and 42,721

Step by Step Solution

1. Step 1: Write the proportion equation
   20,425 : 42,721 = 42,721 : x
2. Step 2: Convert to fraction form
   20,425/42,721 = 42,721/x
3. Step 3: Cross multiply
   20,425x = 42,721 × 42,721
4. Step 4: Simplify right side
   20,425x = 1,825,083,841
5. Step 5: Solve for x
   x = 1,825,083,841/20,425
6. Step 6: Final answer
   x = 89,355.39