A theodolite is placed at a station “P” and a 3m vertical staff is held at Q. The angle of depression made at the reading of 3 m marking on staff is 5°30’. The height of the Instrument at P is 1.3 m and the reduced level of point Q is 507.180 m, the reduced level of point ‘P’ after applying suitable curvature and refraction correction is ________ m. (up to three decimal places)

Take the horizontal distance between P and Q to be 2400 m.