Using the table below, what is the portfolio beta?

Security

Security #$1$

Security #$2$

Security #$3$

Security #$4$

$1\mathrm{.}18$

$1\mathrm{.}07$

$1\mathrm{.}03$

$1\mathrm{.}61$

Amount Invested

Beta

$$3500$

$0\mathrm{.}85$

$$4500$

$1\mathrm{.}24$

$1\mathrm{.}00$

$1\mathrm{.}56$