Not enough information is provided. The easy answer is that you multiply 14,645 by 8.33 to arrive at the answer. But the density of water changes with temperature and the 8.33 only holds at water's greatest density (about 4oC). At 100oC the value could be reduced by 1%. With the large numerical value of the gallons amount this could represent a difference of about 1,000 pounds.
On the other hand the gallons value could be either American or Imperial values. If Imperial. each gallon has a mass of 10 pounds not 8.33 pounds at maximum density and the caveat for temperature still applies.
With this all considered the answer could be anything between 130,342 and 146,450 pounds
100 US gallons of water is about 835 pounds.
Four gallons of water is about 33.4 pounds.
950 gallons of plain water is 7,928.1 pounds.
344.4 pounds for 41.269 gallons of plain water.
608 US gallons of water is about 5,076.8 pounds.
1.4212 gallons of water weighs about 12 (11.86702) pounds.
3,740 US gallons of water weighs about 31,229 pounds.
11,000 US gallons of water weighs about 91,850 pounds.
212 gallons of water weighs 1,770.2 pounds.
20.4 US gallons is about 170.34 pounds.
125 pounds.
2400 pounds