I call for to connect a straight 220 (3-prong) appliance to a 110/220 outlet (4 prong)? How can i do that?

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What is the appliance? If it's a range, replace the cord on the reach. The new codes require a 4 pin outlet but lots older unit have a 3 pin plug. This is a code transformation just a few years ago. The best course is to change the cord.
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well first its 208 not 220,
3 prong= 3 wires, two hots and a ground,
4 prong= 4 wires, two hots, a colourless, and a ground,
you need to run up to date wire, or not hook up the ground and pray you never grasp a short, don't recommend doing it
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Answers:    know what you are doing. you can just plug it contained by, unless it has a different amp rating, next you will need to obtain a plug that has the right amp rating and correct the plug, If you do a lot of this you can trademark a adapter jumper, and use it to run from the 220 to the 110/220. but check your voltages so you do not kill your self or burn out some piece,when wiring a 3 line 220 to a 4 prong 10/220, you do not have to use the 4 prong, beside a 220 circuit.