Is $5.1 trillion enough? Not if you’re Larry Fink. The man who built BlackRock Inc. and helped popularize exchange-traded funds now has ambitions to turn the world’s largest asset manager into something more like Google. It’s all about Aladdin, the pioneering software his company developed to analyze investments. Fink sees Aladdin becoming the Android of finance and predicts technology will soon become one of the biggest of BlackRock’s businesses, with revenue approaching $5 billion in five years.