The Short Version
The claim is substantively accurate. Gold averaged ~$1,232.70/oz in March 2016 and traded at ~$5,274–$5,299/oz on March 1, 2026 — a ratio of approximately 4.28×, which comfortably satisfies the idiomatic meaning of "fourfold." The slight overshoot beyond exactly 4× and the use of a monthly average versus a single-day spot price are minor methodological imprecisions, not material errors. The March 2026 price was partly elevated by acute geopolitical tensions, which may represent a temporary spike.