Steps of construction:
1. Draw PQ = 4 cm as base.
2. With P as centre and radius 5 cm draw an arc.
3. With Q as centre, draw another arc QR = 3 cm.
These arcs intersect at R.
4. With centre P, draw an arc SP = 3.5 cm and with centre Q draw an arc QS = 4.8 cm.
These arcs intersect at point S. Join QR, RS, SP, PR and SQ.
Hence, PQRS is required quadrilateral.