Finding the Fourth Proportional to 2,015.83, 2,781.79 and 1,131.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.83 : 2,781.79 = 1,131.61 : x
2. Step 2: Convert to fraction form
   2,015.83/2,781.79 = 1,131.61/x
3. Step 3: Cross multiply
   2,015.83x = 2,781.79 × 1,131.61
4. Step 4: Simplify right side
   2,015.83x = 3,147,901.38
5. Step 5: Solve for x
   x = 3,147,901.38/2,015.83
6. Step 6: Final answer
   x = 1,561.59