Will a bad proportioning valve prevent brake fluid from going to the caliper on passenger wheel?

No, a bad proportioning valve will not prevent brake fluid from going to the caliper on the passenger wheel. The proportioning valve is responsible for regulating the amount of brake fluid that is sent to the front and rear brakes, but it does not control the flow of brake fluid to individual wheels. If the caliper on the passenger wheel is not receiving brake fluid, it is likely due to a problem with the brake line or the caliper itself.