Finding the Fourth Proportional to 1,078.94, 1,488.76 and 613.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.94 : 1,488.76 = 613.10 : x
2. Step 2: Convert to fraction form
   1,078.94/1,488.76 = 613.10/x
3. Step 3: Cross multiply
   1,078.94x = 1,488.76 × 613.10
4. Step 4: Simplify right side
   1,078.94x = 912,758.76
5. Step 5: Solve for x
   x = 912,758.76/1,078.94
6. Step 6: Final answer
   x = 845.98