Finding the Third Proportional to 396,240 and 855,648

Step by Step Solution

1. Step 1: Write the proportion equation
   396,240 : 855,648 = 855,648 : x
2. Step 2: Convert to fraction form
   396,240/855,648 = 855,648/x
3. Step 3: Cross multiply
   396,240x = 855,648 × 855,648
4. Step 4: Simplify right side
   396,240x = 732,133,499,904
5. Step 5: Solve for x
   x = 732,133,499,904/396,240
6. Step 6: Final answer
   x = 1,847,702.15