Finding the Fourth Proportional to 2,015.56, 2,781.12 and 1,131.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.56 : 2,781.12 = 1,131.40 : x
2. Step 2: Convert to fraction form
   2,015.56/2,781.12 = 1,131.40/x
3. Step 3: Cross multiply
   2,015.56x = 2,781.12 × 1,131.40
4. Step 4: Simplify right side
   2,015.56x = 3,146,559.17
5. Step 5: Solve for x
   x = 3,146,559.17/2,015.56
6. Step 6: Final answer
   x = 1,561.13