"decided through" is correct and usable in written English.
You can use it to refer to a decision being made, for example, "We decided through consensus to move forward with the project."
Everything was decided through money and connections".
He or she will be decided through the quirky process of state primaries and caucuses.
Chance plays no part, and winners are not always decided through combat.
Or have agency directors decided through county-wide or district elections with full campaign cash transparency.
Obviously, the nature of that state is something to be decided through negotiations.
Important legislative issues would be decided through direct consultation with the population.
Successive U.S. administrations have maintained that the status of Jerusalem should be decided through negotiations.
The final design for the memorial was decided through an international competition.
This is an issue that will be decided through presidential leadership".
Israel says their fate will eventually be decided through negotiations with the Palestinians.
Or decided through a series of lawsuits?" "The uncertainty is caused by the ongoing debate," Schurman said.
