How to recalculate ACF field values?

Question

WordPress

There is a custom record type where there is an ACF price field.
The price can be set in 2 currencies, for example, currency1 and currency2 (you can make 2 fields for each currency) In
the records archive, the filter works only for currency1 (this is important)
these fields of values ​​in the second changed automatically according to the given coefficient?

For example, when currency1 * coefficient was filled in, the result was filled in currency2, and when currency2 was changed, it was recalculated according to the formula currency2 / coefficient . The coefficient value will be set separately.

I also want to ask in passing how to change the field values ​​for all records if the coefficient has changed?