Finding the Third Proportional to 389,820 and 852,540

Step by Step Solution

1. Step 1: Write the proportion equation
   389,820 : 852,540 = 852,540 : x
2. Step 2: Convert to fraction form
   389,820/852,540 = 852,540/x
3. Step 3: Cross multiply
   389,820x = 852,540 × 852,540
4. Step 4: Simplify right side
   389,820x = 726,824,451,600
5. Step 5: Solve for x
   x = 726,824,451,600/389,820
6. Step 6: Final answer
   x = 1,864,512.98