Finding the Fourth Proportional to 3,691.31, 5,086.94 and 2,641.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,691.31 : 5,086.94 = 2,641.55 : x
2. Step 2: Convert to fraction form
   3,691.31/5,086.94 = 2,641.55/x
3. Step 3: Cross multiply
   3,691.31x = 5,086.94 × 2,641.55
4. Step 4: Simplify right side
   3,691.31x = 13,437,367.71
5. Step 5: Solve for x
   x = 13,437,367.71/3,691.31
6. Step 6: Final answer
   x = 3,640.28