I am receiving some JSON feed with this data

```
"geometryType": "esriGeometryPoint",
"spatialReference": {
    "wkid": 102100,
    "latestWkid": 3857
  },
```

and set of coordinates like

```
"geometry": {
   "x": -11696523.780400001,
   "y": 4804891.0001000017
}
```

If there a way to convert this x and y to lat/lng which I can use in Google Maps? I have read some references but there either I can`t see the answer, or it's goes very deep into GIS terminology which I just can't afford to learn at the moment.