Finding the Third Proportional to 20,655 and 42,399

Step by Step Solution

1. Step 1: Write the proportion equation
   20,655 : 42,399 = 42,399 : x
2. Step 2: Convert to fraction form
   20,655/42,399 = 42,399/x
3. Step 3: Cross multiply
   20,655x = 42,399 × 42,399
4. Step 4: Simplify right side
   20,655x = 1,797,675,201
5. Step 5: Solve for x
   x = 1,797,675,201/20,655
6. Step 6: Final answer
   x = 87,033.42