Chapter 11 - Section 11.2 - Arithmetic and Geometric Sequences - Exercise Set - Page 647: 67

multiple answers; see details below

With $a_1= 19.652 $ and $d= -0.034 $, then, \begin{array}{l} a_2=a_1+d\\ a_2=19.652+(-0.034)\\ a_2=19.618 ,\\\\ a_3=a_2+d\\ a_3=19.618+(-0.034)\\ a_3=19.584 ,\\\\ a_4=a_3+d\\ a_4=19.584+(-0.034)\\ a_4=19.55 .\end{array}