Strange dimension. Effectively, a 1" steerer should be 25.4mm ( 1-1/8 is 28.6mm).
22.2 is the external dimension for quill 1" stems, which fits a 25.4mm steerer ( 22.2mm internally).
BUt I don't know there was some fork with this steerer... You should find for an addapter 22.2 to 25.4 or 28.6...