[hint]Searching for the first number should give you how to decode this[/hint]

Spoiler

Let’s start by splitting them up

4.1015659297

4.14081774942

4.12128529981

3.70842976927

3.68403149864

3.68403149864

3.75628575422

3.82586236554

4.06154810045

4.48140474656

Notice how we seem to have the prefix and suffix? 4.x would convert to letters and 3.x to numbers. Funny thing, if you search the first number on Google you get something about this numbers being the cubic root of 69. Let’s put everything to the power of 3 and round off to the closest decimal.

4.1015659297

69

4.14081774942

71

4.12128529981

70

3.70842976927

51

3.68403149864

50

3.68403149864

50

3.75628575422

53

3.82586236554

56

4.06154810045

67

4.48140474656

90

69 71 70 51 50 50 53 56 67

Convert decimal to Ascii

EGF32258CZ

Because we put everything to the power of 3 or cube, you now have the keyword.

egf32cube258cz

Code #2

Observations

All numbers in the range of 1 to 5. That’a a good indication.

[hint]What uses a 5×5 grid[/hint]

Spoiler

A range of numbers between 1 & 5 is a good hint that a Polybius square was used.

1

2

3

4

5

1

a

b

c

d

e

2

f

g

h

j

k

3

l

m

n

o

p

4

q

r

s

t

u

5

v

w

x

y

z

Mapping out the coordinates should give you

psveitwmysticeithsegv

psv82mystic837gv

Code #3

Observations

Right amount of numbers for a passcode. You guessed it, same old, some old…