will this powersupply fit in my dell 4700

It will 'fit', but it's not what you are looking for, the power lines wont match up properly
 
where can i get a 400-500 watt powersupply for my dell
You are limited to calling Dell or pulling all the wires out of the P1 and putting them back in the proper order.
 
if u mean i will need to convert it from a 20-pin to a 24-pin well the pic shows a 24-pin, but the last for are detachable, it that gonna be ok?
 
Becuase Dell wants you to buy a new PC from Dell whenever your current Dell becomes out of date (ie weak video and PSU prevent you from upgrading) they use non-upgradable PSUs (which is arguably the key component when upgrading video cards). You can remove the wires from any 24pin connector and rearrange them to what they should be (shown in the links apj101 posted).
 
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