\[\boxed{\text{4.\ 254}}\]
\[31,77 - 26,18 + 10,4 =\]
\[= 5,59 + 10,4 = 15,99\]
\[44,31 - 22,99 + 10,7 =\]
\[= 21,32 + 10,7 = 32,02\]