Finding the Fourth Proportional to 1,018.72, 1,405.86 and 576.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.72 : 1,405.86 = 576.69 : x
2. Step 2: Convert to fraction form
   1,018.72/1,405.86 = 576.69/x
3. Step 3: Cross multiply
   1,018.72x = 1,405.86 × 576.69
4. Step 4: Simplify right side
   1,018.72x = 810,745.40
5. Step 5: Solve for x
   x = 810,745.40/1,018.72
6. Step 6: Final answer
   x = 795.85