Final answer:
In a high-rise fire, the 4th arriving engine is responsible for establishing a fire attack stairwell or corridor, stretching hoselines, and providing additional water supply to higher floors.
Step-by-step explanation:
In a high-rise fire, the 4th arriving engine typically has a specific role. This engine is usually responsible for establishing a dedicated fire attack stairwell or corridor on the fire floor. They may also assist with stretching hoselines and providing additional water supply to firefighters on higher floors.
For example, they may connect their hoseline to a standpipe system in the building, which allows them to access water from the building's water supply at different levels. This helps ensure that firefighters have enough water to fight the fire effectively.
The 4th arriving engine plays a crucial role in ensuring that water is available for firefighting operations in high-rise fires and supports the overall firefighting strategy to control and extinguish the fire.