Finding the Third Proportional to 820,800 and 1,792,128

Step by Step Solution

1. Step 1: Write the proportion equation
   820,800 : 1,792,128 = 1,792,128 : x
2. Step 2: Convert to fraction form
   820,800/1,792,128 = 1,792,128/x
3. Step 3: Cross multiply
   820,800x = 1,792,128 × 1,792,128
4. Step 4: Simplify right side
   820,800x = 3,211,722,768,384
5. Step 5: Solve for x
   x = 3,211,722,768,384/820,800
6. Step 6: Final answer
   x = 3,912,917.60