In the legacy version of the ProgressAlly video shortcode, width and height are specified. You can use CSS to make ProgressAlly videos full width. Add the following custom CSS code to your site: ProgressAlly > General Settings > Styling.
.progressally-vimeo-video-container{
width:100% !important;
height:auto !important;
}
.progressally-vimeo-video-container iframe{width:100% !important;
}