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Switching capacity generally documents the interior bandwidth capacity between ports. On Cisco switches, to avoid queuing any port to port traffic, for full duplex ports, you need twice the port bandwidth capacity. So, 92 Gbps, supports 46 Gbps (duplex).
Forwarding rate is the capacity to forward frames. Minimal size Ethernet requires 1.488 Mpps per gig. 68.4 Mpps (if rated for minimum size - most modern rates are for minimum size) would support about 46 Gbps (notice about the same as the switch's bandwidth capacity).
Stacking bandwidth is bandwidth supported within the whole stack or between a stack pair. How vendors "count" this varies. I believe Cisco totals the pair of stack ports, counting their duplex bandwidth. I.e., I think each stack ports is equal to an Ethernet port of 120 Gbps (duplex).
