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\begin{array}{c}\phantom{\times999}1721\\\underline{\times\phantom{9999}874}\\\end{array}
First line up the numbers vertically and match the places from the right like this.
\begin{array}{c}\phantom{\times999}1721\\\underline{\times\phantom{9999}874}\\\phantom{\times999}6884\\\end{array}
Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 1721 with 4. Write the result 6884 at the end leaving 0 spaces to the right like this.
\begin{array}{c}\phantom{\times999}1721\\\underline{\times\phantom{9999}874}\\\phantom{\times999}6884\\\phantom{\times9}12047\phantom{9}\\\end{array}
Now multiply the first number with the 2^{nd} digit in 2^{nd} number to get intermediate results. That is Multiply 1721 with 7. Write the result 12047 at the end leaving 1 spaces to the right like this.
\begin{array}{c}\phantom{\times999}1721\\\underline{\times\phantom{9999}874}\\\phantom{\times999}6884\\\phantom{\times9}12047\phantom{9}\\\underline{\phantom{\times}13768\phantom{99}}\\\end{array}
Now multiply the first number with the 3^{rd} digit in 2^{nd} number to get intermediate results. That is Multiply 1721 with 8. Write the result 13768 at the end leaving 2 spaces to the right like this.
\begin{array}{c}\phantom{\times999}1721\\\underline{\times\phantom{9999}874}\\\phantom{\times999}6884\\\phantom{\times9}12047\phantom{9}\\\underline{\phantom{\times}13768\phantom{99}}\\\phantom{\times}1504154\end{array}
Now add the intermediate results to get final answer.