Finding the Fourth Proportional to 1,872.75, 2,584.39 and 1,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,872.75 : 2,584.39 = 1,086.78 : x
2. Step 2: Convert to fraction form
   1,872.75/2,584.39 = 1,086.78/x
3. Step 3: Cross multiply
   1,872.75x = 2,584.39 × 1,086.78
4. Step 4: Simplify right side
   1,872.75x = 2,808,672.38
5. Step 5: Solve for x
   x = 2,808,672.38/1,872.75
6. Step 6: Final answer
   x = 1,499.76