Finding the Fourth Proportional to 2,015.40, 2,781.06 and 1,131

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.40 : 2,781.06 = 1,131 : x
2. Step 2: Convert to fraction form
   2,015.40/2,781.06 = 1,131/x
3. Step 3: Cross multiply
   2,015.40x = 2,781.06 × 1,131
4. Step 4: Simplify right side
   2,015.40x = 3,145,378.86
5. Step 5: Solve for x
   x = 3,145,378.86/2,015.40
6. Step 6: Final answer
   x = 1,560.67