Finding the Fourth Proportional to 1,018.49, 1,405.43 and 576.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.49 : 1,405.43 = 576.30 : x
2. Step 2: Convert to fraction form
   1,018.49/1,405.43 = 576.30/x
3. Step 3: Cross multiply
   1,018.49x = 1,405.43 × 576.30
4. Step 4: Simplify right side
   1,018.49x = 809,946.43
5. Step 5: Solve for x
   x = 809,946.43/1,018.49
6. Step 6: Final answer
   x = 795.25