This is the 2685th most frequent Turkish word.
yetkililerine
"To its/their authorities"
Here, 'yetkililerine' is in the dative case, referring to 'to the officials' of an entity.
Şirketin yetkililerine ulaşılamadı.
The officials of the company could not be reached.
In this instance, 'yetkililerine' signifies that the officials of the hospital are being addressed or notified, again in the dative case.
Hastane yetkililerine durumu bildirdim.
I informed the situation to the hospital officials.
Here, 'yetkililerine' means 'to the officials' of the school, using the same dative structure to indicate the entity receiving the action.