Stanford University’s endowment, the world’s third largest, grew 11.3 percent in the most recent fiscal year, officials said this week. The university did not provide the endowment’s total value at the end of the 2018 fiscal year, which ended June 30, but said that it was $26.5 billion at the end of August. Stanford’s announcement followed similar reports by the two universities with larger endowments: Harvard, the world’s biggest, and Yale. Harvard said its endowment grew 10 percent in the 2018 fiscal year, to $39.2 billion. Yale said its endowment climbed 12.3 percent, to $29.4 billion.