Finding the Fourth Proportional to 1,018.80, 1,405.82 and 576.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.80 : 1,405.82 = 576.61 : x
2. Step 2: Convert to fraction form
   1,018.80/1,405.82 = 576.61/x
3. Step 3: Cross multiply
   1,018.80x = 1,405.82 × 576.61
4. Step 4: Simplify right side
   1,018.80x = 810,607.80
5. Step 5: Solve for x
   x = 810,607.80/1,018.80
6. Step 6: Final answer
   x = 795.65