Finding the Third Proportional to 398,433 and 863,238

Step by Step Solution

1. Step 1: Write the proportion equation
   398,433 : 863,238 = 863,238 : x
2. Step 2: Convert to fraction form
   398,433/863,238 = 863,238/x
3. Step 3: Cross multiply
   398,433x = 863,238 × 863,238
4. Step 4: Simplify right side
   398,433x = 745,179,844,644
5. Step 5: Solve for x
   x = 745,179,844,644/398,433
6. Step 6: Final answer
   x = 1,870,276.42