Enforceability of Agreement based on Forged POA

If a power of attorney (POA) was given by ‘X’ to one of the Co-owner ‘Y’ of the Plot while appointing Developer to build a Building on the said plot. Development Agreement was signed between Developer and POA holder i.e. ‘Y’ Now, it has been found that POA is forged and Developer had made forged signatures on it, so FIR registered against Developer. ‘ X’ has not received any benefit as mentioned in the original POA . Copy of original POA is not with ‘X’. Now, when ‘POA’ is forged then What is the enforceability of ‘Development Agreement’ in the view of getting benefit to ‘X’ as mentioned in the ‘Development Agreement’ at least. Does “Development Agreement’ become null and void abandoning and depriving ‘X’ from his share. ‘X’ is the owner of the plot on which building is erected is the fact. What are the options available for ‘X’ to get his share? How forged ‘POA’ will be helpful in court proceeding to get share in Civil and Consumer Court?