The average score of Xiao Ming's 4 tests is 89 points, and the average score of the first three tests is 88 points. What is the score of Xiao Ming's fourth test?
小明4次测验的平均成绩是89分，其中前三次的平均成绩是88分，小明第四次得多少分．
<gadget id="calculator">89 * 4</gadget>
<output>356</output>

<gadget id="calculator">88 * 3</gadget>
<output>264</output>

<gadget id="calculator">356 - 264</gadget>
<output>92</output>

<result>92</result>