Four people, A, B, C, and D, donated money to the Hope Project. As a result, A donated half of the total sum of the other three people, B donated (1/3) of the total sum of the other three people, C donated (1/4) of the total sum of the other three people, and D donated Paid 91 yuan. How much did A, B, C and D donate in total?
甲乙丙丁四人向希望工程捐款，结果甲捐了另外三人总数的一半，乙捐了另外三人总数的(1/3)，丙捐了另外三人总数的(1/4)，丁捐了91元．甲乙丙丁四人共捐了多少元？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/3) - (1/4) - (1/5)</gadget>
<output>13/60 = around 0.216667</output>

<gadget id="calculator">91 / (13/60)</gadget>
<output>420</output>

<result>420</result>