Finding the Fourth Proportional to 2,015.70, 2,781.67 and 1,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.70 : 2,781.67 = 1,131.50 : x
2. Step 2: Convert to fraction form
   2,015.70/2,781.67 = 1,131.50/x
3. Step 3: Cross multiply
   2,015.70x = 2,781.67 × 1,131.50
4. Step 4: Simplify right side
   2,015.70x = 3,147,459.61
5. Step 5: Solve for x
   x = 3,147,459.61/2,015.70
6. Step 6: Final answer
   x = 1,561.47