Commission findings and decisions. If, from the facts presented to the Planning Commission in the application, at the public hearing, or by investigation, the Planning Commission, by a majority vote of a quorum then present, finds that public necessity, convenience, general welfare, or good zoning practice, require the proposed change of zone involved or any portion thereof, the Planning Commission shall recommend such proposed change to the City Council; otherwise the application shall be disapproved. The Planning Commission shall make its findings and recommendation in writing within forty (40) days from the date of completion of the hearing and shall forthwith transmit a copy thereof to the applicant. If the Planning Commission recommends approval of the proposed change or any portion thereof, it shall transmit the application together with its report and recommendation relative thereto, to the City Council for its action. If the Planning Commission fails to make a determination within the time limit herein specified, it shall lose jurisdiction and applicant may appeal to the City Council as hereinafter provided.