Otherwise shall I use Virtual beacon as 4th beacon? Inddor SDK didn’t scan virtual beacon
You can use the SDK to map your location manually, we have a handy guide here:
http://developer.estimote.com/indoor/map-your-location/#the-advanced-way-location-builder
Just keep in mind that the accuracy will be much worse with less beacons than the Indoor Location app suggests is required.
Virtual beacon can’t be used for Indoor Location.