1783494+017:7373

To perform this addition, we need to treat the numbers correctly. The first number is 1,783,494, and the second is 017:7373 which we'll interpret as "17.7373" (assuming the colon is a decimal point).

1,783,494 + 17.7373 = 1,783,511.7373

So, the result is 1,783,511.7373.