Sir,
i have worked on X-cart before. can you please check in your x-cart account if a single patch is available for upgrade to 4.7.2..
also i would advised you to do it in beta folder (or i can do it on my local folder) ..to be on safe side.
Please let me know if you have any questions.
i have 10+ year experience working with PHP and have worked all kinds of application, please check my profile page for feedbacks i have received and details.
Thanks and Regards,
Lokesh