Which nation does the supplier with the account balance of "4393.04" belong to?
nation refers to n_name; account balance of "4393.04" refers to s_acctbal = 4393.04
SELECT T2.n_name FROM supplier AS T1 INNER JOIN nation AS T2 ON T1.s_nationkey = T2.n_nationkey WHERE T1.s_acctbal = 4393.04