i need to rearrange the data in file "data.txt"

i want the data value arrange from small to big.

from example:
original:
3.85663000 100.81888000 174=0
3.85625000 100.81778000 174=0
3.85519000 100.80883000 174=0

after arrange:
3.85519000 100.80883000 174=0
3.85625000 100.81778000 174=0
3.85663000 100.81888000 174=0