3. (3 points) Calculate: $7 \frac{4480}{8333} \div \frac{21934}{25909} \div 1 \frac{18556}{35255}=$
【Solution】Solve: $7 \frac{4480}{8333} \div \frac{21934}{25909} \div 1 \frac{18556}{35255}$,
$$
\begin{array}{l}
=\frac{7 \times 8333+4480}{8333} \times \frac{25909}{21934} \times \frac{35255}{1 \times 35255+18556}, \\
=\frac{62811}{8333} \times \frac{25909}{21934} \times \frac{35255}{53811}, \\
=\frac{997 \times 7 \times 3 \times 3}{641 \times 13} \times \frac{1993 \times 13}{997 \times 11 \times 2} \times \frac{641 \times 11 \times 5}{1993 \times 3 \times 3 \times 3}, \\
=\frac{7 \times 5}{2 \times 3}, \\
=\frac{35}{6} .
\end{array}
$$

The answer is: $\frac{35}{6}$.