Table schema:
CREATE TABLE table_10342194_3 (district VARCHAR, total_amount_of_trees VARCHAR, amount_of_old_trees VARCHAR)

Question: What is the district when the total amount of trees is smaller than 150817.6878461314 and amount of old trees is 1,928 (1.89%)?
SQL: SELECT district FROM table_10342194_3 WHERE total_amount_of_trees < 150817.6878461314 AND amount_of_old_trees = "1,928 (1.89%)"