Finding the Third Proportional to 253,605 and 404,398

Step by Step Solution

1. Step 1: Write the proportion equation
   253,605 : 404,398 = 404,398 : x
2. Step 2: Convert to fraction form
   253,605/404,398 = 404,398/x
3. Step 3: Cross multiply
   253,605x = 404,398 × 404,398
4. Step 4: Simplify right side
   253,605x = 163,537,742,404
5. Step 5: Solve for x
   x = 163,537,742,404/253,605
6. Step 6: Final answer
   x = 644,852.20