Finding the Fourth Proportional to 2,015.36, 2,780.98 and 1,131.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.36 : 2,780.98 = 1,131.26 : x
2. Step 2: Convert to fraction form
   2,015.36/2,780.98 = 1,131.26/x
3. Step 3: Cross multiply
   2,015.36x = 2,780.98 × 1,131.26
4. Step 4: Simplify right side
   2,015.36x = 3,145,994.70
5. Step 5: Solve for x
   x = 3,145,994.70/2,015.36
6. Step 6: Final answer
   x = 1,561.01