Finding the Third Proportional to 389,736 and 570,780

Step by Step Solution

1. Step 1: Write the proportion equation
   389,736 : 570,780 = 570,780 : x
2. Step 2: Convert to fraction form
   389,736/570,780 = 570,780/x
3. Step 3: Cross multiply
   389,736x = 570,780 × 570,780
4. Step 4: Simplify right side
   389,736x = 325,789,808,400
5. Step 5: Solve for x
   x = 325,789,808,400/389,736
6. Step 6: Final answer
   x = 835,924.34