Finding the Fourth Proportional to 2,391.78, 3,584.42 and 1,090.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.78 : 3,584.42 = 1,090.38 : x
2. Step 2: Convert to fraction form
   2,391.78/3,584.42 = 1,090.38/x
3. Step 3: Cross multiply
   2,391.78x = 3,584.42 × 1,090.38
4. Step 4: Simplify right side
   2,391.78x = 3,908,379.88
5. Step 5: Solve for x
   x = 3,908,379.88/2,391.78
6. Step 6: Final answer
   x = 1,634.09