Finding the Third Proportional to 356,212 and 550,856

Step by Step Solution

1. Step 1: Write the proportion equation
   356,212 : 550,856 = 550,856 : x
2. Step 2: Convert to fraction form
   356,212/550,856 = 550,856/x
3. Step 3: Cross multiply
   356,212x = 550,856 × 550,856
4. Step 4: Simplify right side
   356,212x = 303,442,332,736
5. Step 5: Solve for x
   x = 303,442,332,736/356,212
6. Step 6: Final answer
   x = 851,858.82