Finding the Fourth Proportional to 2,561.22, 3,838.68 and 1,391.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.22 : 3,838.68 = 1,391.85 : x
2. Step 2: Convert to fraction form
   2,561.22/3,838.68 = 1,391.85/x
3. Step 3: Cross multiply
   2,561.22x = 3,838.68 × 1,391.85
4. Step 4: Simplify right side
   2,561.22x = 5,342,866.76
5. Step 5: Solve for x
   x = 5,342,866.76/2,561.22
6. Step 6: Final answer
   x = 2,086.06