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Given that volume of a cylinder(V) = 615.8 cubic meters.

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Height of a cylinder(h) = 4 meters.

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olume(V):

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$\"\"$ (Volume of a cylinder)

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$ (Take square root on each side)

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$\"\"$

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Diameter(d).

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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The diameter is 14 meters.