First, convert the mixed numbers to improper fractions.
621=26⋅2+1=212+1=213 941=49⋅4+1=436+1=437 21641=4216⋅4+1=4864+1=4865 Now, substitute these values into the expression:
4865213⋅437=48652⋅413⋅37=48658481=8481÷4865=8481⋅8654=8⋅865481⋅4=2⋅865481=1730481.