When Dell first announced its $67 billion deal to buy the fellow technology giant EMC last year, the transaction faced no small amount of skepticism — in large part because it was simply so expensive. Yet after months of complicated financial maneuvering, EMC shareholders voted overwhelmingly last month to approve the sale. Dell isn’t out of the woods yet. It still needs approval from Chinese regulators. And once the deal closes later this year, the computer giant faces the challenge of integrating a fellow old-line tech company in a world in which new technologies have already upset other venerable names and other old-guard companies are breaking apart.