Required information

Seven liters of a monatomic ideal gas, originally at $415K$ and a pressure of $3\mathrm{.}7$atm $($called state $1),$ undergoes the following processes:

state $1$ state $2$ isothermal expansion to $V_2=4\mathrm{.}4V_1$

state $2$ state $3$ isobaric compression

state $3$ state $1$ adiabatic compression to its original state

And calculate the temperature $($in K$)$ of the gas in state $3.$