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Question:

$2108_w75_h37.png$ ____

A $4678_w20_h37.png$
Explaination

$8154_w55_h37.png$
$9235_w53_h38.png$ (convert to improper fractions)
$3719_w53_h38.png$ (invert the divisor and multiply)
$5020_w53_h39.png$ (simplify: note that the 5s cancel)
$7011_w64_h38.png$ (multiply and convert to mixed number)