Declaration of Colums in 2d Array with Apps Script

Question

I have an CSV Data in which I have Data which is a Number, but if I import ist into an Arry in Apps Scripts it will not be recognized as an Number. Its recognized as "NaN".

How can I format die Colum in the 2d Arry as a Float Number?

With following code i do the import:

var file_PP = DriveApp.getFilesByName('PayPal.csv').next();
var file_ST = DriveApp.getFilesByName('Stripe.csv').next();
var file_BE = DriveApp.getFilesByName('Backend.csv').next();
var Daten_PP = Utilities.parseCsv(file_PP.getBlob().getDataAsString());
var Daten_ST = Utilities.parseCsv(file_ST.getBlob().getDataAsString());
var Daten_BE = Utilities.parseCsv(file_BE.getBlob().getDataAsString());