I've never used this, but you might see if it meets your needs. http://www.componentone.com/SuperProducts/OLAPSilverlight/

>Hi
>
>I have a big problem on my current project. We have to produce reports for a Silverlight 5 front end application which has absolutely no database access. All the data is sent to the application using WCF. On top of that, we are also using Rx which seems to cause other problems.
>
>We started to look at Telerik Reporting but cannot get good results.
>
>What are you guys using in situation like this (VS 2010, Silverlight 5.0 OOB front end, ...)?