As an example, this start with the number 621.12 in cell A1
=A1-INT(A1) = .12
=CHOOSE(LEN(A1)-LEN(INT(A1))-1,10,100,1000) = 100
The above finds the length of the decimal portion in order to turn it into a whole number.
Multiply the two above to arrive at 12
Now all you need to do is multiply the integer of A1 to 14 to get (631*14) = 8834
Finally, put it all together to get:
=CHOOSE(LEN(A1)-LEN(INT(A1))-1,10,100,1000)*(A1-INT(A1))+(INT(A1)*14)
for a total of 8846
One problem, if any particular data cell does not contain a decimal value, this will fail.