Finding the Fourth Proportional to 1,018.79, 1,406.12 and 576.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.79 : 1,406.12 = 576.71 : x
2. Step 2: Convert to fraction form
   1,018.79/1,406.12 = 576.71/x
3. Step 3: Cross multiply
   1,018.79x = 1,406.12 × 576.71
4. Step 4: Simplify right side
   1,018.79x = 810,923.47
5. Step 5: Solve for x
   x = 810,923.47/1,018.79
6. Step 6: Final answer
   x = 795.97