To calculate a date that is 40 weeks in the future from a given date, which in this case is the 4th of November, you need to add 40 weeks to that date. First, determine how many days are in 40 weeks by multiplying 40 by 7 (as there are 7 days in a week). This will give you the total number of days to add to the original date.

Next, simply add that total number of days to the 4th of November to find the future date. To manually calculate this, start by adding 28 days to the 4th of November to account for 4 weeks. Then, add an additional 12 days to cover the remaining 2 weeks, resulting in the future date, which is the 22nd of September.