Finding the Fourth Proportional to 1,078.47, 1,488.33 and 612.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.47 : 1,488.33 = 612.72 : x
2. Step 2: Convert to fraction form
   1,078.47/1,488.33 = 612.72/x
3. Step 3: Cross multiply
   1,078.47x = 1,488.33 × 612.72
4. Step 4: Simplify right side
   1,078.47x = 911,929.56
5. Step 5: Solve for x
   x = 911,929.56/1,078.47
6. Step 6: Final answer
   x = 845.58