I have 3 backups need to import into the database

Hi,

My site is Best Pictures and Wallpapers
I’m moving this to a new hosting. I have 3 different backups, in the first backup posts starting from April is there up to June. But in the 2nd backup the earlier posts were deleted, ie posts from April to may is not in it. But it has posts were up to September. In the 3rd backup, posts starts from June to December.
I want to merge these 3 backups into there as one. ie Posts were starts from April – December. How it can be merged without loosing any data, please help me. Currently the site is running with the 1st backup.