If x can be proportional to the three numbers 3, 4, and 6, find the value of x.
若x能与3，4，6这三个数组成比例，求x值．
<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 3</gadget>
<output>2</output>

<result>2</result>