To solve for x you would divide 200 by 0.85 which would give you 235 5/7 (two hundred thirty seven and five seventeenths).

[latex]0.85x=200\ \ \ \ /:0.85\\\\x=\frac{200}{0.85}\\\\x=\frac{20000}{85}\\\\x=\frac{4000}{17}\\\\x=235\frac{5}{17}[/latex]