Finding the Third Proportional to 394,430 and 863,939.75

Step by Step Solution

1. Step 1: Write the proportion equation
   394,430 : 863,939.75 = 863,939.75 : x
2. Step 2: Convert to fraction form
   394,430/863,939.75 = 863,939.75/x
3. Step 3: Cross multiply
   394,430x = 863,939.75 × 863,939.75
4. Step 4: Simplify right side
   394,430x = 746,391,891,630.06
5. Step 5: Solve for x
   x = 746,391,891,630.06/394,430
6. Step 6: Final answer
   x = 1,892,330.43