This is the 12170th most frequent Russian word.
инвестиционное
"Investment-related" or "investment."
The word 'инвестиционное' is used here as an adjective describing the type of decision being made, emphasizing its relation to investments.
Инвестиционное решение требует тщательного анализа.
The investment decision requires careful analysis.
'Инвестиционное' acts as a qualifying adjective for 'предложение', specifying that the proposal pertains to investment matters.
Инвестиционное предложение заинтересовало многих предпринимателей.
The investment proposal attracted many entrepreneurs.
In this sentence, 'инвестиционное' describes the equipment as being related to the function or area of investments.