Any other provision of law to the contrary notwithstanding, the Commission shall: Cooperate and participate, in accordance with the processes and procedures hereinafter provided, with an authority to be created by interstate compact between Maryland, Virginia and the District of Columbia, in the formulation by that authority of that portion of its transit plan relating to the transit facilities and services to be provided within the district and in the revision and amendment thereof from time to time; Negotiate with the authority, the Northern Virginia Transportation District and the District of Columbia an agreement for the allocation among such governments and the district of the costs to be incurred by the authority in providing transit facilities and service; and Provide, in the manner hereinafter set forth, funds to meet the obligations allocated to the district pursuant to such agreement.