Finding the Fourth Proportional to 1,018.83, 1,406.12 and 576.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.83 : 1,406.12 = 576.78 : x
2. Step 2: Convert to fraction form
   1,018.83/1,406.12 = 576.78/x
3. Step 3: Cross multiply
   1,018.83x = 1,406.12 × 576.78
4. Step 4: Simplify right side
   1,018.83x = 811,021.89
5. Step 5: Solve for x
   x = 811,021.89/1,018.83
6. Step 6: Final answer
   x = 796.03