N:1:N relation: multiply two columns with many to many relation

[sistancy]

Hello everyone,
thank you for reading this and trying to help me.

I have 3 tables which are related like:

Table "Mengen" shows articles with their quantity (quantity = "[Menge]") for building a product.

Table "Preise3" shows articles with different prices (prices = "[Preis]") at different months.

So now I want to calculate the costs of a product by multiplying the quantity for the necessary product with the price of the article for each month. Is this possible with a measure?

I have a temporary solution in which I merged every column of table "Mengen" and "Preise3" into one table. But the refresh time is a diseaster and takes very long, thats why I am looking for another solution.

I can give you an example database if you are willing to help me out. Thanks!

Best regards

Marius Douben