Finding the Third Proportional to 401,760 and 621,648

Step by Step Solution

1. Step 1: Write the proportion equation
   401,760 : 621,648 = 621,648 : x
2. Step 2: Convert to fraction form
   401,760/621,648 = 621,648/x
3. Step 3: Cross multiply
   401,760x = 621,648 × 621,648
4. Step 4: Simplify right side
   401,760x = 386,446,235,904
5. Step 5: Solve for x
   x = 386,446,235,904/401,760
6. Step 6: Final answer
   x = 961,883.30