Donald Trump's Presidential Job Approval Ratings
Approval rating	Dates
%
Most recent weekly average	38	Oct 2-8, 2017
Term average to date	        39  	Jan 20, 2017-present
High point, weekly average	45	Jan 20-29, 2017
Low point, weekly average	35	Aug 21-27, 2017
High point, three-day average	46	twice; last on Jan 23-25, 2017
Low point, three-day average	34	six times; last on Aug 30-Sep 1, 2017
GALLUP

Trump has only reached your "45.6%" right after inauguration.
As to your statement "the majority disagree with this".  The majority have never approved of Trump in any sector of the government.
But much like the person you voted for, don't let facts get in your way.