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As it is store and forward mechanism so data will be forwarded from the switch when entire data is received on it..

Hence transmission time will be involved at 4 places : Source and 3 switches..

And there are 4 links hence 4 times the one link propogation delay involves..

Hence 

Total delay  =  4 * Transmission delay + 4 * Propogation delay

                  =  4 * ( Data size / Bandwidth + link length / speed of medium )

                  =  4 * ( (1500 * 8 / 100 * 106 ) * 106  +  12 )

                  =  4 * ( 120 + 12 )

                  =  4 * ( 132 )

                  =  528 μs

Hence total delay involved  =  528  μs

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