Eastman Kodak Co., which is under chapter 11 protection, said that cash fell 21 percent to $345.8 million in August, Bloomberg News reported yesterday. The net loss was $79.3 million after $12.6 million in interest expense and $11 million in reorganization costs. Sales were $168.4 million, and Kodak said that cash has increased among its foreign operations that are not in bankruptcy. Kodak on Sept. 28 filed a second request for an expansion of the exclusive right to propose a reorganization plan. If approved by the judge at an Oct. 17 hearing, the plan-filing deadline will become Feb. 28.