Q:

Find Rank in Microsoft Report

Is there any way I can find the rank of a set of values in Microsoft Reports? 
For instance, in order to produce a table like the one below, what function/formula do I enter in the Rank column? 

+------+-----+
|Value | Rank|
+------+-----+
| 12   | 3   |
| 30   | 5   |
|  5   | 1   |
| 10   | 2   |
| 24   | 4   |
+------+-----+

Update
Values in the value column are produced from calculations on the report-side so I cannot find the rank using a query. 

A:

The closest you are going to get is the RowNumber function, but that depends on the underlying sort order. 
I thoroughly recommend moving the value column logic server side and creating using SQL to get a rank value there.