It's possible, and is usually fairly easy, but you'll need to know the amp load, and that's what makes the whole exercise tricky. Getting 1 or 2 amps is very straightforward.
But you're doing fine, really.
At 12.36V, you're 3% over the mean, and that's still within the 5% spec.
at 4.79 - 4.83, you're nearing the 5% limit, but you're not there yet. Measured properly, this would be an indication that your power supply is reaching it's limit, either because of design, or age.
But you might be able to tweak it back into spec, if you have the ability to open up a PSU: find the trim pot, and make the adjustment. DO NOT do this with a PC as a load: you'll need a power resistor.
Also, and MOST IMPORTANTLY, your voltages need to be measured accurately: you can loose 0.2 v at the ATX power connector alone. Again, if you have the ability to crack open a PSU, you can set your clip/probes directly on the output, on the PCB. An easier way, is to get the PSU going with a load (aforementionned resistor), then measure the voltages right on the exposed wire of the molex connectors.
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