Answer:
Jere's number could be any of these  28.430, 28.419 , 28.42
Explanation:
Jere is thinking of number less than 28.431 and greater than 28.404
numbers less than 28.431 in the option will be
 28.430, 28.419 , 28.42
numbers greater than 28.404
28.430, 28.419 , 28.435 , 28.42 
so, the required numbers can be 
 28.430, 28.419 , 28.42
hence, Jere's number could be any of these  28.430, 28.419 , 28.42