Finding the Fourth Proportional to 3,131.92, 4,671.32 and 2,641.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.92 : 4,671.32 = 2,641.57 : x
2. Step 2: Convert to fraction form
   3,131.92/4,671.32 = 2,641.57/x
3. Step 3: Cross multiply
   3,131.92x = 4,671.32 × 2,641.57
4. Step 4: Simplify right side
   3,131.92x = 12,339,618.77
5. Step 5: Solve for x
   x = 12,339,618.77/3,131.92
6. Step 6: Final answer
   x = 3,939.95