155.710, or, 155.715 will be closer to the frequency (only 2.5khz ) You would most likely not to hear the intended comms at 155.7525 which would be 40khz away. This is because of the deviation +/- of 5khz allowed in the transmit on radios by the FCC. That is why for the newer narrow band FM, the new step sizes are in the more up to date scanners.
HTH,
Larry
Entering 155.7525 will show you 155.755. The PRO-94 isn't capable of translating the frequency you input any closer than that. 155.7125 will show 155.715.