In this paper authors offer the new method for solving coherent tasks in distributed computing system, based on resources of personal computers. Parameters of such resources are dynamically varying and that makes it hard for their application in distributed computations. To achieve ability of effective usage of personal computers, proposed method uses multiagent approach: proactive agent controls every personal computer in distributed computing system, and process of task solving is dispatched decentralized by interactions of agents. To solve every incoming coherent task agents of the system unite into community and that makes it easier to dispatch and perform computations. The main benefit of proposed method is decreasing the price for creating and maintenance of distributed computing system.