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In 1867 that was a huge ammount of monwy(see some western movies and you will agree)
10.8 tons of gold since 1 dollar was fixed weight of 1.5grams (23.22 grains) of gold from 1834 until 1900)
Around 14 Billion, considering the current value of gold.
The US$ 7.2 million check used to pay for Alaska ($119 million in 2014 dollars)[1]
http://www.wolframalpha.com/input/?i=1867+US%247.2+million
Or around 400M, if you consider the gold equivalent.