Finding the Fourth Proportional to 2,015.28, 2,781.02 and 1,131.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.28 : 2,781.02 = 1,131.04 : x
2. Step 2: Convert to fraction form
   2,015.28/2,781.02 = 1,131.04/x
3. Step 3: Cross multiply
   2,015.28x = 2,781.02 × 1,131.04
4. Step 4: Simplify right side
   2,015.28x = 3,145,444.86
5. Step 5: Solve for x
   x = 3,145,444.86/2,015.28
6. Step 6: Final answer
   x = 1,560.80