Finding the Fourth Proportional to 1,018.94, 1,406.15 and 576.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.94 : 1,406.15 = 576.80 : x
2. Step 2: Convert to fraction form
   1,018.94/1,406.15 = 576.80/x
3. Step 3: Cross multiply
   1,018.94x = 1,406.15 × 576.80
4. Step 4: Simplify right side
   1,018.94x = 811,067.32
5. Step 5: Solve for x
   x = 811,067.32/1,018.94
6. Step 6: Final answer
   x = 795.99