Finding the Fourth Proportional to 1,018.71, 1,405.89 and 576.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.71 : 1,405.89 = 576.65 : x
2. Step 2: Convert to fraction form
   1,018.71/1,405.89 = 576.65/x
3. Step 3: Cross multiply
   1,018.71x = 1,405.89 × 576.65
4. Step 4: Simplify right side
   1,018.71x = 810,709.98
5. Step 5: Solve for x
   x = 810,709.98/1,018.71
6. Step 6: Final answer
   x = 795.82