If a ball is hit between first and home and is in foul territory but is touched by a player standing in fair territory before the ball hits the ground is it fair or fowl ball?

The position of the fielder's body or feet, have absolutely nothing to do with judging whether a ball is fair or foul. The judgment is based solely upon the relationship between the BALL and the LINE at the moment the fielder touches the ball, or at the moment the ball comes to a stop, or on outfield fly balls; the moment it touches the fielder or the ground.