Solve the equation: ((18.7)/(x))=20.9:19, x=how much.
解方程：((18.7)/(x))=20.9：19，x=多少．
<gadget id="calculator">20.9 / 19</gadget>
<output>1.1</output>

<gadget id="calculator">18.7 / 1.1</gadget>
<output>17</output>

<result>17</result>