Finding the Third Proportional to 9,986 and 20,404

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986 : 20,404 = 20,404 : x
2. Step 2: Convert to fraction form
   9,986/20,404 = 20,404/x
3. Step 3: Cross multiply
   9,986x = 20,404 × 20,404
4. Step 4: Simplify right side
   9,986x = 416,323,216
5. Step 5: Solve for x
   x = 416,323,216/9,986
6. Step 6: Final answer
   x = 41,690.69