One in four consumers thinks prices will continue to rise.
Literal
Prices [topic-は] from-now-on also rise continue probably [quotative-と], consumers [possessive-の] four [location-に] one person [topic-は] thinking.
消費者の４人に１人 means 'one in four consumers' — a proportional expression. ~と考えている marks the quoted thought. 今後も means 'from now on too/going forward.' A news-style sentence with embedded quotation.