Finding the Third Proportional to 394,407 and 863,446.50

Step by Step Solution

1. Step 1: Write the proportion equation
   394,407 : 863,446.50 = 863,446.50 : x
2. Step 2: Convert to fraction form
   394,407/863,446.50 = 863,446.50/x
3. Step 3: Cross multiply
   394,407x = 863,446.50 × 863,446.50
4. Step 4: Simplify right side
   394,407x = 745,539,858,362.25
5. Step 5: Solve for x
   x = 745,539,858,362.25/394,407
6. Step 6: Final answer
   x = 1,890,280.49