Finding the Fourth Proportional to 2,015.57, 2,781.69 and 1,131.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.57 : 2,781.69 = 1,131.32 : x
2. Step 2: Convert to fraction form
   2,015.57/2,781.69 = 1,131.32/x
3. Step 3: Cross multiply
   2,015.57x = 2,781.69 × 1,131.32
4. Step 4: Simplify right side
   2,015.57x = 3,146,981.53
5. Step 5: Solve for x
   x = 3,146,981.53/2,015.57
6. Step 6: Final answer
   x = 1,561.34