If MV Estonia had been travelling since 19:15 then by 1:48 (six hours and 33 minutes, or 6.55 hrs) when it went off the radar, it had travelled roughly 193 km which meant it was travelling an average of 18 knots, ergo, it will have travelled 119 miles*/.868976 [miles to knots conversion] = 137 knots over 6.55 hours = an average speed of 20.91 knots per hour. Its capability was only circa 20 knots at full speed, so must have been carried along by the waves - southwesterly, similar to the wind.
A few points raised by your calculations:
Where did you get the initial figure of 193km from?
You then converted that to 119 miles. (I get 120 but let's not quibble.)
You then converted that wrongly to 137 nautical miles. It's 104 nm. You applied the multiplier backwards.
Also 'knots' is nautical miles per hour, not nautical miles. You meant nm.
So now you have two different answers for the same calculation: 18 knots or 20.91 knots. (Not 'knots per hour'.) So your results are contradictory. That should have been a clue you had blundered. I wonder that you didn't spot this.
A southwesterly wind is one which blows
from the southwest, not
toward the southwest.
If you ever read the JAIC report you would discover section 5.4 describing the wind and wave conditions in considerable detail.
https://onse.fi/estonia/chapt05.html#4
And you would see that section 5.5 has considerable detail on the Estonia's speed too.
https://onse.fi/estonia/chapt05.html#5
Have you been letting AI do your calculations again? You appreciate they produce plausible-looking nonsense, right?