I think your calculation is off by a factor of 3. And the information is also slightly off.
From the information we got last year, we are entitled to 0.3707 TRW shares per SIAF share. At the time (end of October 2018) valued at $3.40645 (per TRW share). This should give you a value of 0.3707 * 3.40645 = 1.26277... So about $1.26 in value from TRW per SIAF share.
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