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From the drawing in the article, the fuel capacity is 47,210 gallons. Also from the article the weight of fuel is 6.7 - 6.8 pounds per gallon.

Thus, a fully loaded 747 has 316,000 pounds of fuel.

To put this in context, the maximum takeoff weight of a 737-700 is 154,000 pounds.

A fully fueled 747 has 2x the maximum weight of a 737 just in fuel!

The 747 horizontal stabilizer has an area of 136.6 m², while a 737 main wing has an area of only 102m² to 127m².

The engine nacelles on a 777-300 are the same diameter as the entire fuselage of a 737. The big planes are very, very big.

I really like this picture that demonstrates this size difference: https://www.flickr.com/photos/ramonkok/27081197680