Finding the Third Proportional to 393,040 and 842,150

Step by Step Solution

1. Step 1: Write the proportion equation
   393,040 : 842,150 = 842,150 : x
2. Step 2: Convert to fraction form
   393,040/842,150 = 842,150/x
3. Step 3: Cross multiply
   393,040x = 842,150 × 842,150
4. Step 4: Simplify right side
   393,040x = 709,216,622,500
5. Step 5: Solve for x
   x = 709,216,622,500/393,040
6. Step 6: Final answer
   x = 1,804,438.79