  We present the results of a search for additional exoplanets in all
multiplanetary systems discovered to date, employing a logarithmic spacing
between planets in our Solar System known as the Titius-Bode (TB) relation. We
use the Markov Chain Monte Carlo method and separately analyse 229
multiplanetary systems that house at least three or more confirmed planets. We
find that the planets in $\sim53\%$ of these systems adhere to a logarithmic
spacing relation remarkably better than the Solar System planets. Using the TB
relation, we predict the presence of 426 additional exoplanets in 229
multiplanetary systems, of which 197 candidates are discovered by interpolation
and 229 by extrapolation. Altogether, 47 predicted planets are located within
the habitable zone (HZ) of their host stars, and five of the 47 planets have a
maximum mass limit of 0.1-2$M_{\oplus}$ and a maximum radius lower than
1.25$R_{\oplus}$. Our results and prediction of additional planets agree with
previous studies' predictions; however, we improve the uncertainties in the
orbital period measurement for the predicted planets significantly.
