Adding Columns To A Query From Results

I have a table called approval_levels in which I have 2 columns:

|LEVEL_ID |NAME |
|1 |app_level_1 |
|2 |app_level_2 |
|3 |app_level_3 |

I have a second table called requests, in which I have 3 columns:

|REQUEST_ID |PRODUCT_NAME |MANUFACTURER |
|1 |wd-40 |Acme |
|2 |Windex |Acme |
|3 |Propane |Acme |

I have a third table which links the two called request_approvals which has 2 columns: REQUEST_ID, LEVEL_ID. When a request is approved for a specific level, I insert a value into this table. So, for example, lets say request 1 has been approved for all 3 levels, request 2 has been approved for only level 1, and request 3 has been approved for level 3, the table would show something like this.

|REQUEST_ID |LEVEL_ID |
|1 |1 |
|1 |2 |
|1 |3 |
|2 |1 |
|3 |3 |

Ok, so here the challenge: I need to show in a report all the requests, create a columns for each level and show whether or not that request is approved for that level. The end result has to be something like this:

|REQUEST_ID |PRODUCT_NAME |MANUFACTURER |app_level_1 |app_level_2 |app_level_3 |
|1 |wd-40 |Acme |X |X |X |
|2 |Windex |Acme |X | | |
|3 |Propane |Acme | | |X |

Keep in mind that if another value is added to the approval_levels table (ie app_level_4), I need to add another column to the table call app_level_4 dynamically.Now, how in the world do I do something like this?