SELECT "Grand Rapids (GRR)" FROM table_9692 WHERE "Detroit (DTW)" = '$378.55'
What was the passenger fare for Grand Rapids, when the passenger fare for Detroit was $378.55?
CREATE TABLE table_9692 (
    "Year" real,
    "Lansing (LAN)" text,
    "Detroit (DTW)" text,
    "Grand Rapids (GRR)" text,
    "Flint (FNT)" text,
    "Kalamazoo (AZO)" text,
    "Saginaw (MBS)" text
)