(Reuters) - BlackRock Inc , the world's largest asset manager, missed analysts' estimates for quarterly profit on Friday, as investment advisory and securities lending revenue fell and costs rose.Its institutional funds added $87.36 billion (£69.77 billion) in the second quarter, up from $29.12 billion in the first quarter.Investors poured more money into BlackRock's actively managed funds aimed at beating the market over the low-fee passive-investment products.BlackRock said its..