You need a third table where you have a separate record for each inspection.
You can create your report on an Inspections layout and add Project and Developer fields to this layout. You can place these fields in the Header if you only need to find Inspection records for one project at a time. If you need a report for multiple Projects and/or multiple developers, you'd set it up as a summary report and place such fields in a Subsummary part.
If you are new to summary reports:
Here's a link to a simple tutorial on setting up summary reports that you may find useful:
Creating Filemaker Pro summary reports--Tutorial