Example 5. (Shanghai Junior High School Mathematics Competition, 1987) A school held a mathematics competition, and five students, Jia, Yi, Bing, Ding, and Cheng, placed in the top five. Before the awards were given out, the teacher asked them to guess the ranking of each person.

Jia said: Yi third, Bing fifth,
Yi said: Cheng fourth, Ding fifth;
Bing said: Jia first, Cheng fourth;
Ding said: Bing first, Yi second;
Cheng said: Jia third, Ding fourth.
The teacher said, each rank was guessed correctly by someone, then who got the fourth place?
瞥：This example still uses the table method.
\begin{tabular}{|c|c|c|c|c|c|}
\hline If alive & & $Yi$ & Ling & $Ding$ & Cheng \\
\hline Jia: Yi(3): Bing(5) & & (3) & (5) & & \\
\hline Yi: Cheng(4), Guang(5) & & & & (5) & (4) \\
\hline Bing, Ping(1), Wu(4) & (1) & & & & (4) \\
\hline Ding: Liang(1), Yi(2) & & (2) & (1) & & \\
\hline I, Jia(3), J(4) & (3) & & & (4) & \\
\hline
\end{tabular}

From the condition: Each rank has someone who guessed correctly. We compare the table to find a breakthrough. From the table, we see that only one person guessed the second place, so we can determine: Yi is the second place $\Rightarrow$ Yi is not the third place, hence Jia is the third place $\Rightarrow$ Jia is not the first place $\Rightarrow$ Bing is the first place, hence Bing is not the fifth place $\Rightarrow$ Ding is the fifth place, hence Ding is not the fourth place $\Rightarrow$ Wu is the fourth place. The one who got the fourth place is Wu.