The Roses were dominant in attack and cohesive through the court in an 89-28 win in South Africa.
Eleanor Cardwell scored 40 from 41 attempts and Helen Housby 26 from 28 as England outpaced their opponents.
They will face world number one side Australia on Thursday in their final Pool F match.
England are second in their group behind the Diamonds, who also confirmed their place in the last four with victory over Malawi on Tuesday.
The Roses have struggled so far with slow starts and high error counts.
However they made a drastic improvement against Fiji, ranked 19th in the world, with shooters Housby and Cardwell, a much-anticipated partnership in the build-up to the tournament, registering 50 goals between them by half-time.
Imogen Allison was again effective in mid-court while Chelsea Pitman – making her 50th appearance in the Roses dress – provided the shooters with 29 goal assists.
Head coach Jess Thirlby rotated her side in the second half and there was a drop in intensity as their scoring rate decreased but young shooter Olivia Tchine proved a solid option from the bench, while veteran Jade Clarke remains influential at her sixth World Cup.
“This England team have gone pretty much under the radar,” former England defender Eboni Usoro-Brown said on BBC TV.
“Everyone is talking about Jamaica, New Zealand and Australia and what form they are in, but I think England have just quietly gone about their business.”
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