Finding the Fourth Proportional to 3,936.47, 5,431.86 and 2,257.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,936.47 : 5,431.86 = 2,257.61 : x
2. Step 2: Convert to fraction form
   3,936.47/5,431.86 = 2,257.61/x
3. Step 3: Cross multiply
   3,936.47x = 5,431.86 × 2,257.61
4. Step 4: Simplify right side
   3,936.47x = 12,262,994.30
5. Step 5: Solve for x
   x = 12,262,994.30/3,936.47
6. Step 6: Final answer
   x = 3,115.23