Finding the Fourth Proportional to 1,078.29, 1,488.04 and 612.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.29 : 1,488.04 = 612.54 : x
2. Step 2: Convert to fraction form
   1,078.29/1,488.04 = 612.54/x
3. Step 3: Cross multiply
   1,078.29x = 1,488.04 × 612.54
4. Step 4: Simplify right side
   1,078.29x = 911,484.02
5. Step 5: Solve for x
   x = 911,484.02/1,078.29
6. Step 6: Final answer
   x = 845.31