I'm using ArcGIS 10.3
I have a polygon shapefile and need to be divided into four equal parts each polygon
There is a tool in ArcGIS to do this
Have you already looked at this GeoNet thread?
A couple of links from Parcel Fabric (Requires Standard/Advanced license).
Dividing parcels by area—Help | ArcGIS for Desktop
Parcel split: area description—Help | ArcGIS for Desktop
ArcGIS Pro now has this tool to split polygons into equal areas:
Subdivide Polygon—Data Management toolbox | ArcGIS Desktop