Finding the Fourth Proportional to 4,081.59, 6,116.72 and 2,129.90

Step by Step Solution

1. Step 1: Write the proportion equation
   4,081.59 : 6,116.72 = 2,129.90 : x
2. Step 2: Convert to fraction form
   4,081.59/6,116.72 = 2,129.90/x
3. Step 3: Cross multiply
   4,081.59x = 6,116.72 × 2,129.90
4. Step 4: Simplify right side
   4,081.59x = 13,027,960.69
5. Step 5: Solve for x
   x = 13,027,960.69/4,081.59
6. Step 6: Final answer
   x = 3,191.88