Finding the Fourth Proportional to 2,015.33, 2,780.80 and 1,131.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.33 : 2,780.80 = 1,131.17 : x
2. Step 2: Convert to fraction form
   2,015.33/2,780.80 = 1,131.17/x
3. Step 3: Cross multiply
   2,015.33x = 2,780.80 × 1,131.17
4. Step 4: Simplify right side
   2,015.33x = 3,145,540.80
5. Step 5: Solve for x
   x = 3,145,540.80/2,015.33
6. Step 6: Final answer
   x = 1,560.81