[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's evaluate ~
[tex]\qquad \tt \dashrightarrow \:(6 \times 1000) + (1 \times 10) + (8 \times \frac{1}{1} ) + (9 \times \frac{1}{10} ) + \frac{4}{100} [/tex]
[tex]\qquad \tt \dashrightarrow \:6000 + 10 + 8 + \frac{9}{10} + \frac{4}{100} [/tex]
[tex]\qquad \tt \dashrightarrow \: \dfrac{600000 + 1000 + 800 + 90 + 4}{100} [/tex]
[tex]\qquad \tt \dashrightarrow \: \dfrac{601894}{100} [/tex]
or
[tex]\qquad \tt \dashrightarrow \:{6018.94}{} [/tex]