Finding the Third Proportional to 394,385 and 863,404

Step by Step Solution

1. Step 1: Write the proportion equation
   394,385 : 863,404 = 863,404 : x
2. Step 2: Convert to fraction form
   394,385/863,404 = 863,404/x
3. Step 3: Cross multiply
   394,385x = 863,404 × 863,404
4. Step 4: Simplify right side
   394,385x = 745,466,467,216
5. Step 5: Solve for x
   x = 745,466,467,216/394,385
6. Step 6: Final answer
   x = 1,890,199.85