Finding the Fourth Proportional to 2,015.57, 2,781.61 and 1,131.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.57 : 2,781.61 = 1,131.43 : x
2. Step 2: Convert to fraction form
   2,015.57/2,781.61 = 1,131.43/x
3. Step 3: Cross multiply
   2,015.57x = 2,781.61 × 1,131.43
4. Step 4: Simplify right side
   2,015.57x = 3,147,190.05
5. Step 5: Solve for x
   x = 3,147,190.05/2,015.57
6. Step 6: Final answer
   x = 1,561.44