Remove Null From Pivot Data?

I have a pivot query returning data ordered by a timestamp. In any give second only a few of the columns will have data, the remaining columns are NULL. I would like to default the NULL data values to the previous NON NULL value by timestamp.

Current Pivot Table:

Time RowA RowB RowC
12:15:12 NULL NULL 50
12:15:11 97 NULL NULL
12:15:10 98 25 51
12:15:06 101 NULL 50
12:15:05 100 NULL NULL

What should be returned:

Time RowA RowB RowC
12:15:12 97 25 50
12:15:11 97 25 51
12:15:10 98 25 51
12:15:06 101 NULL 50
12:15:05 100 NULL NULL

I know that I can do this user a cursor and handling the output is code, but I would prefer to do this in a single set based query.