how to get 51,589.86? please help me

Date June 1, Year 1 Dec 1, Year1 June 1, Year 2 Dec 1, Year 2 June 1, Year 3 Dec 1, Year 3 June 1, Year 4 Dec 1, Year 4 June 1, Year 5 Nominal Interest Effective Interest Discount Amortization Carrying Value 0.04 0.05 3,691,500 160,000 184,575.00 24,575.00 3,716,075.00 160,000 185,803.75 25,803.75 3,741,878.75 160,000 187,093.94 27,093.94 3,768,972.69 160,000 188,448.63 28,448.63 3,797,421.32 160,000 189,871.07 29,871.07 3,827,292.39 160,000 191,364.62 31,364.62 3,858,657.01 160,000 192,932.85 32,932.85 3,891,589.86 160,000 51,589.86 108,410.14 4,000,000.00