Finding the Fourth Proportional to 1,018.71, 1,529.46 and 558.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.71 : 1,529.46 = 558.09 : x
2. Step 2: Convert to fraction form
   1,018.71/1,529.46 = 558.09/x
3. Step 3: Cross multiply
   1,018.71x = 1,529.46 × 558.09
4. Step 4: Simplify right side
   1,018.71x = 853,576.33
5. Step 5: Solve for x
   x = 853,576.33/1,018.71
6. Step 6: Final answer
   x = 837.90