Finding the Fourth Proportional to 2,015.71, 2,781.84 and 1,131.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.71 : 2,781.84 = 1,131.57 : x
2. Step 2: Convert to fraction form
   2,015.71/2,781.84 = 1,131.57/x
3. Step 3: Cross multiply
   2,015.71x = 2,781.84 × 1,131.57
4. Step 4: Simplify right side
   2,015.71x = 3,147,846.69
5. Step 5: Solve for x
   x = 3,147,846.69/2,015.71
6. Step 6: Final answer
   x = 1,561.66