Order list on when items should be created.

Question

I have a list of calculated fields, these fields reference other fields in their calculations. I need to create these fields beforehand as they will not exist.

I was wondering what would be the best approach for this Example List

1. Field1 has Field2 in the calculation
2. Field2 has Field4 in the calculation
3. Field3 has Field1 in the calculation
4. Field4

I'm not sure on how to approach this.