Alright, I'm going to do a little mathematics here to hopefully end this issue.
Now, we have to take into account that there are only 3 primary seating areas inside the Silverdome. In the picture that was provided so graciously by Red Hot Scott,(who bagged it from
www.silverdome.com) we can take the floor seats out of the equation for now.
On the Silverdome's website, they list the number of seats per section as follows: (I am not going to count the luxury or club boxes, as I am not sure if they were used during WWF WrestleMania III (I do not pollute the timeline like the World Wildlife Fund would want me to do, and I hope that no-one else here will, either.))
Lower Level (the level just before the floor seats)-42,082
Club Level (the level just above the Lower Level)-7,342
Now, we add the Lower Level and Club Level figures up first, and we get 49,424 fans SO FAR.
We now take that number, and add that to this amount:
Upper Level (the level at the very top)- 29,399
So, 49,424 + 29,399 = 78,823
78,823 WWF-E Fans occupied the permanent Silverdome seats.
To figure out our floor seat attendance, we take the 93,173 number and Subtract that from 78,823. So:
93,173 - 78,823 = 14,350
14,350 sat on the floor of the Silverdome during WMIII.
So if you add it all up, the final figure will, indeed, be 93,173 who attended WM III in 1987.
There. It is settled.
*im a genius!

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