(d) In any county that currently embraces all or a part of the territory of a regional open-space district and an authority formed pursuant to Division 26 (commencing with Section 35100), the allocation shall be distributed between the county and these entities as follows:

1. (1) First, the funds shall be apportioned between the district and the county in proportion to the population of the county that is included within the territory of the district, and the proportion of the population of the county that is outside the district. The amounts resulting from this calculation shall be known as the district’s share, and the county’s first balance. The district’s share shall be allocated to the district. The county’s first balance shall be further apportioned as provided in paragraph (2).
2. (2) The county’s first balance, as determined in accordance with paragraph (1), shall be further apportioned between the authority and the county in proportion to the population of the county that is included within the territory of the authority, and the proportion of the population of the county that is outside the authority. The amounts resulting from this calculation shall be known as the authority’s share, and the county’s second balance.
3. (3) The authority’s share shall be divided equally between the county and the authority. The county shall receive all of the county’s second balance.