Multiple animation blends

Hi guys I have several humanoid animations like idle, attack etc. Scenario:
Idle animation have baked into pose transformation and rotation and basically parent model is standing still while root node moves.
I transition to attack animation with blending at any given time.
Attack animation have applied root motion to parent so it moves and rotates.

Problem: I have no way of knowing where exactly will that animation end because it can start from any moment from idle animation and have blend.
Is there some way of knowing this or somehow move and adjust parent so that it is in the same position as in the original animation?