South Carolina Get Ready Grade 6 Mathematics Chapter 1

$9\frac{1}{2}÷2\frac{1}{4}=$

What is the least common multiple of 4 and 8?

William is asked to solve the following problem and to show his work: $2\frac{3}{8}÷1\frac{4}{7}$

He worked the problem as follows:

$$\begin{gathered} \mathit{S}\mathit{t}\mathit{e}\mathit{p}\mathbf{ }\mathbf{1}\mathbf{:}\mathbf{ }2\frac{3}{8}÷1\frac{4}{7}=\frac{19}{8}÷\frac{11}{7} \\ \mathit{S}\mathit{t}\mathit{e}\mathit{p}\mathbf{ }\mathbf{2}\mathbf{:}\mathbf{ }\frac{19}{8}÷\frac{11}{7}=\frac{19}{8}\times \frac{7}{11} \\ \mathit{S}\mathit{t}\mathit{e}\mathit{p}\mathbf{ }\mathbf{3}\mathbf{:}\mathbf{ }\frac{19}{8}\mathbf{\times }\frac{7}{11}\mathbf{=}\frac{136}{88} \\ \mathit{S}\mathit{t}\mathit{e}\mathit{p}\mathbf{ }\mathbf{4}\mathbf{:}\mathbf{ }\frac{136}{88}=1\frac{6}{11} \end{gathered}$$

William came to an incorrect answer. In which step did the error first occur?