Set up a WP Cron scheduled event to update calculated ACF field

I have 3 ACF fields set up on a custom post type:

Number Value A - automatically updated every minute

Number Value B - automatically updated every minute (at the same time as Value A)

Number Value C - a calculated ACF field, dividing Value A by Value B, x 100 to give a percentage

Number Value C only recalculates when I go into each individual custom post and click update.

I need a solution whereby Value C is recalculated/updated every minute automatically, then republished, based on the current values in A and B within the custom post, whether they have changed or not.

I presume the way to do this would be via a scheduled Cron Event?

Any help would be greatly appreciated!

Many thanks