Since you do not say what is the expected result, my answer is guessing you want the element 3 from line 4.

Try this:

#!/usr/bin/perl
use warnings;
use strict;

my @eachlinecmd =  `ping 127.0.0.1`;
my @eachwordcmd = split (/ /, $eachlinecmd[4]);
print "@eachlinecmd\n";
print "@eachwordcmd\n";
print "$eachlinecmd[4]\n";
print "$eachwordcmd[3]\n";
[download]

perl "F:\perl_TK\perl1ping.pl"
Process started >>>

 Pinging 127.0.0.1 with 32 bytes of data:
 
 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
 
 Ping statistics for 127.0.0.1:
     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
 Approximate round trip times in milli-seconds:
     Minimum = 0ms, Maximum = 0ms, Average = 0ms

Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

bytes=32
<<< Process finished.
================ READY ================
[download]