Finding the Fourth Proportional to 1,078.39, 1,488.31 and 599.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.39 : 1,488.31 = 599.90 : x
2. Step 2: Convert to fraction form
   1,078.39/1,488.31 = 599.90/x
3. Step 3: Cross multiply
   1,078.39x = 1,488.31 × 599.90
4. Step 4: Simplify right side
   1,078.39x = 892,827.38
5. Step 5: Solve for x
   x = 892,827.38/1,078.39
6. Step 6: Final answer
   x = 827.92