Final answer:
The missing step should be placed between steps 3 and 4 to ensure the student measures and prepares the chain at the correct distance before hanging the swing.
Step-by-step explanation:
The missing step provided should be inserted into the sequence of instructions between steps 3 and 4. This insertion point allows the student to correctly place the S hooks before attempting to hang the swing with the chain. Doing so is necessary as it ensures the distance from each arm of the swing to the ground is considered before securing and leveling the swing. The revised order of steps would have the student install the eye bolts, then measure and prepare the chains using the S hooks to ensure the swing is the correct distance from the ground, and then finally hang the swing.