Adapter - 3 pin female XLR to 1/4" mono plug-Neutrik NA2FP
NA2FP
$10.49

Neutrik audio adapters offer a convenient way to adapter between different connector types.

3 pole XLR female – Mono 1/4" plug (tip, sleeve contact)

Wired according to IEC 268-12:
Pin 2: signal
Pin 1 and 3: connected to ground