Finding the Fourth Proportional to 3,934.35, 5,428.71 and 2,255.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,934.35 : 5,428.71 = 2,255.61 : x
2. Step 2: Convert to fraction form
   3,934.35/5,428.71 = 2,255.61/x
3. Step 3: Cross multiply
   3,934.35x = 5,428.71 × 2,255.61
4. Step 4: Simplify right side
   3,934.35x = 12,245,052.56
5. Step 5: Solve for x
   x = 12,245,052.56/3,934.35
6. Step 6: Final answer
   x = 3,112.34