Finding the Fourth Proportional to 2,015.42, 2,781.34 and 1,131.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.42 : 2,781.34 = 1,131.23 : x
2. Step 2: Convert to fraction form
   2,015.42/2,781.34 = 1,131.23/x
3. Step 3: Cross multiply
   2,015.42x = 2,781.34 × 1,131.23
4. Step 4: Simplify right side
   2,015.42x = 3,146,339.37
5. Step 5: Solve for x
   x = 3,146,339.37/2,015.42
6. Step 6: Final answer
   x = 1,561.14