MARSEILLE, France — Chris Froome virtually sealed a fourth Tour de France victory on the penultimate stage on Saturday, stamping his authority on the race in a time trial in Marseille streets. Froome, the last rider to set off from the Stade Velodrome, finished third in the 22.5-kilometer stage won by Maciej Bodnar, and increased his overall lead. Colombian rider Rigoberto Uran moved to second place in the general classification, 54 seconds behind Froome, after Frenchman Romain Bardet cracked and dropped to third overall. Only the largely ceremonial stage into Paris on the Champs-Elysees on Sunday stands between Froome and his fourth triumph in five years. “It’s just an amazing feeling,” Froome said. “It was so close coming into this TT.