Finding the Fourth Proportional to 1,028.43, 1,418.67 and 779.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028.43 : 1,418.67 = 779.31 : x
2. Step 2: Convert to fraction form
   1,028.43/1,418.67 = 779.31/x
3. Step 3: Cross multiply
   1,028.43x = 1,418.67 × 779.31
4. Step 4: Simplify right side
   1,028.43x = 1,105,583.72
5. Step 5: Solve for x
   x = 1,105,583.72/1,028.43
6. Step 6: Final answer
   x = 1,075.02