Binary:

$\hspace{1cm} 7 \hspace{1cm} 4 \hspace{1cm} 6 \hspace{1cm} 6$

$\hspace{.8cm} 111 \hspace{.6cm} 100 \hspace{.6cm} 110 \hspace{.6cm} 110$

$(7466)_{8} = (111100110110)_{2}$

Hexadecimal:

$\hspace{.8cm} \underbrace{1111}\underbrace{0011}\underbrace{0110}$

$\hspace{1cm} 15 \hspace{.6cm} 3 \hspace{.7cm} 6$

$\hspace{1cm} E \hspace{.7cm} 3 \hspace{.7cm} 6$

$(7466)_{8} = (E36)_{16}$

Decimal:

$(7466)_{8}$

$= 7*8^3 + 4*8^2 + 6*8^1 + 6*8^0$

=7*512 + 256 +48 + 6

=3584 + 256 + 48 +6

=3894

$(7466)_{8}=(3894)_{10}$