0.4771=x/2.303*8.14[50/323*373
calc.-x?
The given expression could mean a lot of things. It's because of the arrangement and lack of brackets/parenthesis. I suggest you type it again.
It could mean for example,
0.4771 = x / (2.303*8.14[(50/323)*373])
Thus in this case, x = 516.42
It could also mean,
0.4771 = (x / 2.303*8.14) [(50/323)*373]
Thus in this case, x = 0.1549
...and so on.