Finding the Fourth Proportional to 3,929.39, 5,422.55 and 2,251.35

Step by Step Solution

1. Step 1: Write the proportion equation
   3,929.39 : 5,422.55 = 2,251.35 : x
2. Step 2: Convert to fraction form
   3,929.39/5,422.55 = 2,251.35/x
3. Step 3: Cross multiply
   3,929.39x = 5,422.55 × 2,251.35
4. Step 4: Simplify right side
   3,929.39x = 12,208,046.69
5. Step 5: Solve for x
   x = 12,208,046.69/3,929.39
6. Step 6: Final answer
   x = 3,106.86