Finding the Fourth Proportional to 2,225.55, 3,339.09 and 839.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,225.55 : 3,339.09 = 839.28 : x
2. Step 2: Convert to fraction form
   2,225.55/3,339.09 = 839.28/x
3. Step 3: Cross multiply
   2,225.55x = 3,339.09 × 839.28
4. Step 4: Simplify right side
   2,225.55x = 2,802,429.89
5. Step 5: Solve for x
   x = 2,802,429.89/2,225.55
6. Step 6: Final answer
   x = 1,259.21