Finding the correct power adapter for iMac 24 M4 256GB desktop computer

It should have come with the Mac.

Did it not come in the box?

It looks like this (without or with ethernet):

click here ➜ iMac 24" What's included - Apple Support

Are you looking for a replacement?

Apple doesn't directly sell replacement power adapters for iMac in their online store, but you can find them on Amazon.com

click here ➜ iMac 24" Power Adapter - Amazon.com

or here iMac 24" Power Adapter with Ethernet (Blue) - Amazon.com

Did you lose the one that came with it?

Interesting that the one without Ethernet is more than the one with. 🤔

Yeah, all of 1 cent less. 😜😂

Still. I thought the one would be $20 less or so. 🤷‍♂️

I went ahead and checked. The base iMac with the Ethernet power brick is $30 more.