How to find all the values in a row that contains a certain value in a dataset?

I have a 16740x9 dataset, and the fourth column in the dataset has a value of 4.3000. I want to find the values of the first three columns that share the same row with this value. I've tried commands like: [row] = find(mostrain == 4.3000)

row =

     1
and

>> date = W(find(mostrain == 4.3000))

But I get errors like: Error using dataset/subsrefParens (line 9) Dataset array subscripts must be two-dimensional.

Error in dataset/subsref (line 69) [varargout{1:nargout}] = subsrefParens(a,s);

And

>> date = mostrain(row)

date =

    4.3000

>> [a b]=find(W == 4.3000); Undefined operator '==' for input arguments of type 'dataset'.

>> date = W(mostrain) Error using dataset/subsrefParens (line 9) Dataset array subscripts must be two-dimensional.

Error in dataset/subsref (line 69) [varargout{1:nargout}] = subsrefParens(a,s);

... So how would I do it?