Write a function `merge_dictionaries_three(dict1, dict2, dict3)` that takes three dictionaries as input and merges them into a single dictionary. If there are overlapping keys, the value from the dictionary that appears later in the arguments should take precedence.
#### Example Usage
```python [main.nopy]
merge_dictionaries_three({"a": 1, "b": 2}, {"b": 3, "c": 4}, {"c": 5, "d": 6})
# Output: {"a": 1, "b": 3, "c": 5, "d": 6}
merge_dictionaries_three({"x": "X"}, {"y": "Y"}, {"z": "Z"})
# Output: {"x": "X", "y": "Y", "z": "Z"}
```