Currency conversion in BPM Approval for Expense report

Users are creating expense report in multiple currencies

We have approval limit in USD say 10,000 USD and we have GAM(Global approval matrix) Rates used to convert the USD amount in another currency say INR

Now i want to write logic in BPM for expense reports approvals in USD currency say If Expense report.Remibursable amount > 10,000 USD then Approval should go to Vice president

If Expense report is created in Reimbursable currency "INR" then i want BPM to convert the Remibursable amount ( say INR 20000 ) into USD and check for approvals

Do we have any logic which can be used here, i understand this is being used in procurement as a standard functionality