The second trapezoid has the length of x as 4.2 cm.
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Scaling </h3>
Scaling is the increase or decrease in the size of an object or figure by a factor k, so as to create an image.
Scaling leads to the creation of similar figures. Similar figures have the same shape and the ratio of their corresponding sides are in the same proportion
From the question, since both trapezoids are similar, hence:
14.7 / 4.9 = 12.6 / x
x = 4.2 cm
The second trapezoid has the length of x as 4.2 cm.
Find out more on scaling at: brainly.com/question/25324744
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