Finding the Third Proportional to 389,215.50 and 842,401.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,215.50 : 842,401.50 = 842,401.50 : x
2. Step 2: Convert to fraction form
   389,215.50/842,401.50 = 842,401.50/x
3. Step 3: Cross multiply
   389,215.50x = 842,401.50 × 842,401.50
4. Step 4: Simplify right side
   389,215.50x = 709,640,287,202.25
5. Step 5: Solve for x
   x = 709,640,287,202.25/389,215.50
6. Step 6: Final answer
   x = 1,823,258.03