**Solution:**

=> x = 0.3178178178… ….(i)

Multiplying both sides of (i) by 10, we get

10x = 3.178178… ….(ii)

Multiplying both sides of (i) by 10000, we get

10000x = 3178.178… ….(iii)

Subtracting (ii) from (iii), we get

9990x = 3175

**=> x = 3175/9990 = 635/1998**