Finding the Fourth Proportional to 2,390.40, 3,580.56 and 1,092.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.40 : 3,580.56 = 1,092.96 : x
2. Step 2: Convert to fraction form
   2,390.40/3,580.56 = 1,092.96/x
3. Step 3: Cross multiply
   2,390.40x = 3,580.56 × 1,092.96
4. Step 4: Simplify right side
   2,390.40x = 3,913,408.86
5. Step 5: Solve for x
   x = 3,913,408.86/2,390.40
6. Step 6: Final answer
   x = 1,637.14