If an effect asks you to divide damage among targets, you must divide the unmodified damage before tripling it.

If a creature with trample you control would deal combat damage to a blocking creature while you control Fiery Emancipation, you must assign its unmodified damage. For example, a 3/3 creature with trample blocked by a 2/2 creature can have 2 damage assigned to the blocking creature and 1 damage assigned to the defending player. It will then deal 6 damage to the blocking creature and 3 damage to the defending player.

If multiple replacement or prevention effects try to modify damage that would be dealt to a player or permanent, the player or the controller of the permanent chooses the order in which they apply.