Finding the Third Proportional to 20,578 and 42,612

Step by Step Solution

1. Step 1: Write the proportion equation
   20,578 : 42,612 = 42,612 : x
2. Step 2: Convert to fraction form
   20,578/42,612 = 42,612/x
3. Step 3: Cross multiply
   20,578x = 42,612 × 42,612
4. Step 4: Simplify right side
   20,578x = 1,815,782,544
5. Step 5: Solve for x
   x = 1,815,782,544/20,578
6. Step 6: Final answer
   x = 88,239.02