Finding the Third Proportional to 297,018 and 640,404

Step by Step Solution

1. Step 1: Write the proportion equation
   297,018 : 640,404 = 640,404 : x
2. Step 2: Convert to fraction form
   297,018/640,404 = 640,404/x
3. Step 3: Cross multiply
   297,018x = 640,404 × 640,404
4. Step 4: Simplify right side
   297,018x = 410,117,283,216
5. Step 5: Solve for x
   x = 410,117,283,216/297,018
6. Step 6: Final answer
   x = 1,380,782.59