Resize Mac Partition is Disabled - how to partition properly
Apple's tools won't shrink the Bootcamp partition, so you have several options:


get a third party tool to back up Bootcamp and/or shrink it outright 
install OS X on an external drive and run it there (basically punt)


There's a slight chance you have a siruation that could be remedied from he command line. Post the diskutil list details that Disk Utility doesn't show by default. Also, can you lose no data on Windows side? If you could delete that partition the side Mac could resize without any data loss. 

See:


Unable to increase partition size with subsequent blocking partition
OS X Partition not resizable
Resizing dual boot partitions in Yosemite