we know that
one square mile is equal to [tex] 258.999\ hectares [/tex]
so
by proportion
[tex] \frac{258.999}{1} \frac{hectares}{square\ miles} =\frac{x}{50} \frac{hectares}{square\ miles}\\\\ x=50*258.999= 12,949.95\ hectares[/tex]
therefore
the answer is
[tex] 12,950\ hectares [/tex]