JQuery : Currency conversion rate and calculations on selection dropdown

Hi,
I am looking fof for a solution with jquery that get the currency rate and calculate some fields.
Please see the attached screenshot.
The required currencies numbers are arround 8.
It is enough to have one currency rate update per day.

Once the county (Land) has been selected then the currency rate for selected countries currency should be inserted into field for CHF. The rest is to see in attached Screenshot

A code similar to this is required.

$("#x_FIELD1").on('change keyup paste mouseup', function() {
console.log(+$("#x_FIELD2").val(), $("#x_FIELD1").val()); // Check the result in the console of your browser
$("#x_FIELD3").val(+$("#x_FIELD2").val() * +$("#x_FIELD1").val());
});