Fourier analysis – How to know the place of the frequency specified in a list

I have such a list list = decompress[FromCharacterCode[ Flatten[ImageData[Import[“http://i.stack.imgur.com/jTZ0w.png”],"Byte"]]]] {95.5049,83.3677,58.1087,31.9574,15.7867,8.69225,7.36413,8.5051,11.8377,18.5031,27.8077,36.211,40,7328,48.3083089089089089089089089089089089089089089089089089029890298908295295298295295295295295296.09.09.09.08.38.389083083089083089089089089089089089089089090890908909089090890908909089090890890909090909090909090909090909090909090909090909090909090909000 From US $ 39.00, 32.1083,54.4969,74.9133 … , 7.7973.9.84671,14.9329,23.5806,33.2632,40.0336,42.5976.42.49.42.479.43.43.43.3803,41.46.43.312.56.35.3.36.3286.2293, trade and development of services. , 20.3194,30.6338,51.3648,71.5985,72.4108,55.1716} We can visualize it: ListLinePlot[list]…

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