It depends on the particulars of the installation. However, with 4 generators, they can't each take 75% of the load--only about 25% each if properly adjusted.
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In vino veritas; in cervisia carmen; in aqua E. coli.
Step 1. Determine the exact number of generators you wish to synchronize, 3 or 4. If you have already purchased them, this should be relatively easy. Just count them. If not, consult the purchase order in the quantity column.
Step 2. Commission a competent electrical engineering firm to be on site during the synchronization. I expect in this case your insurance company might be interested, too.
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