[tex]\large\text{$\sf\:a_{n}=a_{1}+(a_{n}-1)q$\sf}[/tex]
q = 8 - 4 = 4.
[tex]\large\text{$\sf\:a_{22}=4+(22-1)4\quad\to\quad\boxed{a_{22}=88}$\sf}[/tex]
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[tex]\large\text{$\sf\:a_{n}=a_{1}+(a_{n}-1)q$\sf}[/tex]
q = 8 - 4 = 4.
[tex]\large\text{$\sf\:a_{22}=4+(22-1)4\quad\to\quad\boxed{a_{22}=88}$\sf}[/tex]