[herber@wirehub.nl]

How heavily modified is your X-Cart 4.6.1?

It's not too big of a step to just upgrade it yourself to 4.7.9, which supports PHP7.1 & 7.2 and has all the latest features/functionality.

I'd say do the upgrade in a few versions in between until you're at the latest & then keep up2date with every release.
We've done this since the beginning of 2014, when we had a large server crash and needed to restore from backups. Since then, we've just kept up with the latest release of XC4 every single time an update has been released and it has been great: bugs keep getting fixed every time, new features are added, new versions of PayPal and security updates and it also means we got to enable PHP7.1 and now PHP7.2, with the accompanying speed improvements (which are very good compared to PHP5.6!).

Definitely worth it, at least if your cart isn't heaviliy modified. Ours isn't, which is why we're able to keep up quite well.