To convert the binary number \( 101111.1101_2 \) to decimal, we first convert the integer part and the fractional part separately:
- Integer part: \( 101111_2 = 32 + 16 + 8 + 4 + 0 + 1 = 61 \)
- Fractional part: \( 0.1101_2 = 0.5 + 0.25 + 0 + 0.0625 = 0.8125 \)
Thus, the decimal equivalent is \( 61 + 0.8125 = 47.8125 \). Therefore, the correct answer is option (3).