Almost 100 artists from around the world applied, but next spring, it will be Janet Echelman who has her sculpture installed on the Rose Kennedy Greenway. The artist, who has a studio in Brookline and has done projects from California to Lithuania, will create a sculpture made of knotted fiber suspended hundreds of feet over a section of the Greenway. The work, which will connect existing buildings, will be on view through the fall of 2015. It will cost about $1 million in total, with half of that money coming from the Richard and Susan Smith Family Foundation. Just over $100,000 will come from the National Endowment for the Arts and the New England Fund for the Arts.