By the year’s end, worldwide media tablet sales will approach 120 million. That’s according to new research from Gartner (NYSE: IT), which reports that tablets will experience a 98% increase from 2011 sales to 60 million. Not surprisingly, Apple (NASDAQ: AAPL) is credited as the producer of the dominant media tablet operating system, iOS, which is “projected to account for 61.4% of worldwide media tablet sales to end users in 2012,” Gartner wrote in its release. “Despite the arrival of Microsoft-based devices to this market, and the expected international rollout of the Kindle Fire, Apple will continue to be the market leader through the forecast period.”