When I was making a PowerPoint presentation I was directing the reader to the slide after the next one when I realised it sounded incredibly clunky and if there was a specific word for that concept, in the vein of penultimate. This could also be used for items in a list. Example sentence:
To discover how I coded this program please consult the _______ slide.
Best Answer
On a different forum someone offered "Postproximate" in response to a similar request. The word doesn't exist right now, but hey, you never know, it might catch on.