Let the number be y.
If 15% of 45.4 is y, this implies that
[tex]\begin{gathered} \frac{15}{100}\times45.4=y \\ \\ \end{gathered}[/tex]Thus, we have
[tex]\begin{gathered} \frac{15\times45.4}{100}=y \\ \Rightarrow\frac{681}{100}=y \end{gathered}[/tex]Evaluating y,
[tex]\begin{gathered} y=\frac{681}{100} \\ \Rightarrow y=6.81 \end{gathered}[/tex]Hence, the number is 6.81.