Formula to convert weekly and biweekly income to monthly amount for IL TANF

Per https://www.dhs.state.il.us/page.aspx?item=15824:
>If a client receives income weekly, add the weekly amounts together (after dropping cents from each paycheck), divide by 4, drop cents, and multiply by 4.3. If the month happens to include a periodic extra check (i.e., 5 checks received), divide by 5, drop cents, and multiply by 4.3.
>If a client receives income bi-weekly (i.e., every 2 weeks), add the bi-weekly amounts together (after dropping cents from each paycheck), divide by 2, drop cents, and multiply by 2.15. If the month happens to include a periodic extra check (i.e., 3 checks received), divide by 3, drop cents, and multiply by 2.15.