Finding the Fourth Proportional to 1,805.78, 2,491.98 and 1,019.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.78 : 2,491.98 = 1,019.88 : x
2. Step 2: Convert to fraction form
   1,805.78/2,491.98 = 1,019.88/x
3. Step 3: Cross multiply
   1,805.78x = 2,491.98 × 1,019.88
4. Step 4: Simplify right side
   1,805.78x = 2,541,520.56
5. Step 5: Solve for x
   x = 2,541,520.56/1,805.78
6. Step 6: Final answer
   x = 1,407.44