The estate of longtime arts benefactor Ed Rasmuson made a sizable contribution to a trio of Anchorage performing arts organizations this month. Rasmuson’s estate announced Wednesday it had donated $1 million each to endowment funds established for the Anchorage Concert Association, Anchorage Symphony Orchestra and Anchorage Opera. The long-term endowments, established at the Alaska Community Foundation, provide both annual income and a measure of continuing financial stability for the organizations.