Finding the Fourth Proportional to 1,018.50, 1,405.31 and 576.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.50 : 1,405.31 = 576.51 : x
2. Step 2: Convert to fraction form
   1,018.50/1,405.31 = 576.51/x
3. Step 3: Cross multiply
   1,018.50x = 1,405.31 × 576.51
4. Step 4: Simplify right side
   1,018.50x = 810,168.24
5. Step 5: Solve for x
   x = 810,168.24/1,018.50
6. Step 6: Final answer
   x = 795.46