Finding the Fourth Proportional to 1,018.78, 1,405.77 and 576.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.78 : 1,405.77 = 576.55 : x
2. Step 2: Convert to fraction form
   1,018.78/1,405.77 = 576.55/x
3. Step 3: Cross multiply
   1,018.78x = 1,405.77 × 576.55
4. Step 4: Simplify right side
   1,018.78x = 810,496.69
5. Step 5: Solve for x
   x = 810,496.69/1,018.78
6. Step 6: Final answer
   x = 795.56