Finding the Fourth Proportional to 2,015.86, 2,781.98 and 1,131.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.86 : 2,781.98 = 1,131.68 : x
2. Step 2: Convert to fraction form
   2,015.86/2,781.98 = 1,131.68/x
3. Step 3: Cross multiply
   2,015.86x = 2,781.98 × 1,131.68
4. Step 4: Simplify right side
   2,015.86x = 3,148,311.13
5. Step 5: Solve for x
   x = 3,148,311.13/2,015.86
6. Step 6: Final answer
   x = 1,561.77