I'm afraid this question sounds a little backwards. Except for a couple of unneeded zeros at the end, your number is already in decimal form. The term "decimal equivalent" in my experience refers to the decimal form of a fraction. For example, if you have a 1/4" (quarter inch) drill bit, the decimal equivalent is 0.25 inches.
3.4600 is the same as 3.46
is the same as 3 46/100
is the same as 3 23/50
Since 23 is a prime number, the fraction 23/50 cannot be further reduced. If you are willing to take it out of reduced form,