Final answer:
The given sentence is grammatically incorrect. The correct sentence is "Il est quatre heures et quart (4h15)."
Step-by-step explanation:
The given sentence, "Il est quatre heure et de quart (4h15)." is grammatically incorrect.
When telling the time in French, the number of hours is usually followed by the word "heure", without the plural form. Additionally, to indicate a quarter past the hour, the word "et" is used followed by the word "quart". Therefore, the correct sentence would be "Il est quatre heures et quart (4h15)."
It is important to be aware of these rules when speaking and writing in French to ensure grammatical accuracy.
Learn more about French grammar