IGRP problems ??

I have IGRP problems ?? I have three Cisco Catalyst 3200/2503 and one
2513 router all stringed together as in 1,2,3 and 4. I am using IGRP
protocol and ios v11.2 and v12.2 on each. When ever I log into router
number 4's console I can ping throughout the network. From my desktop
I can only ping to the 3rd router. When I ping interfaces on the 4th
router from my desktop I receive an error message "Reply from
192.168.0.100: Destination host unreachable".  From my desktop I can
ping the directly connected interface(s1) but not the other sides of
the router(e0, tokenring0).

cis2513>sh ip protocol
Routing Protocol is "igrp 10"
  Sending updates every 90 seconds, next due in 48 seconds
  Invalid after 270 seconds, hold down 280, flushed after 630
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  IGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  IGRP maximum hopcount 100
  IGRP maximum metric variance 1
  Redistributing: igrp 10
  Routing for Networks:
    192.168.0.0
  Routing Information Sources:
    Gateway         Distance      Last Update
    192.168.4.4          100      00:01:16
  Distance: (default is 100)