Finding the Fourth Proportional to 2,015.55, 2,781.34 and 1,131.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.55 : 2,781.34 = 1,131.37 : x
2. Step 2: Convert to fraction form
   2,015.55/2,781.34 = 1,131.37/x
3. Step 3: Cross multiply
   2,015.55x = 2,781.34 × 1,131.37
4. Step 4: Simplify right side
   2,015.55x = 3,146,714.85
5. Step 5: Solve for x
   x = 3,146,714.85/2,015.55
6. Step 6: Final answer
   x = 1,561.22