sqrt( (5.6 + 5/7 + -2.3) / (5.237 + -7/9) )

$${\sqrt{{\frac{\left({\mathtt{5.6}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{5}}}{{\mathtt{7}}}}{\mathtt{\,-\,}}{\mathtt{2.3}}\right)}{\left({\mathtt{5.237}}{\mathtt{\,-\,}}{\frac{{\mathtt{7}}}{{\mathtt{9}}}}\right)}}}} = {\mathtt{0.948\: \!799\: \!794\: \!856\: \!976}}$$

rounded to six significant figures would it be : 0.948800