In terms of the combined consumers sales, Dell is probably #3.
The revenue Dell pulled from their consumer division (which includes desktop/laptops/thin-clients/mobile devices and so on) is $8.9 billion.
> End User Computing revenue was $8.9 billion in the quarter, a 9 percent decrease. Operating income for the quarter was $224 million, a 65 percent decrease. Dell desktop and thin-client revenue declined 2 percent, mobility revenue declined 16 percent, and software from third parties and peripherals revenue declined 6 percent.
Do you have a source at all for that? I've found multiple articles saying Lenovo overtook HP for that title around July 2013 but nothing naming Apple. According to [0] Apple weren't in the top six at that point.
I did find articles from early 2012 calling Apple the biggest but that was of course based on iPads almost entirely. For example [1] has some figures from then, 5.2 million macs to over 10 million units each from HP, Lenovo and Dell.