Finding the Fourth Proportional to 1,078.94, 1,488.94 and 613.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.94 : 1,488.94 = 613.19 : x
2. Step 2: Convert to fraction form
   1,078.94/1,488.94 = 613.19/x
3. Step 3: Cross multiply
   1,078.94x = 1,488.94 × 613.19
4. Step 4: Simplify right side
   1,078.94x = 913,003.12
5. Step 5: Solve for x
   x = 913,003.12/1,078.94
6. Step 6: Final answer
   x = 846.20