Excess molar heat capacities CEp,m and excess molar volumes VEm of {x1CH3(CH2)5CH3 + x2CH3C(CH3)2CH2CH(CH3)CH3 + x3CH3C(CH3)2OC2H5 + (1 - x1 - x2 - x3)C2H5OH}(l) II. Ternary mixtures and prediction of quaternary values