Finding the Fourth Proportional to 1,078.52, 1,488.36 and 612.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.52 : 1,488.36 = 612.77 : x
2. Step 2: Convert to fraction form
   1,078.52/1,488.36 = 612.77/x
3. Step 3: Cross multiply
   1,078.52x = 1,488.36 × 612.77
4. Step 4: Simplify right side
   1,078.52x = 912,028.38
5. Step 5: Solve for x
   x = 912,028.38/1,078.52
6. Step 6: Final answer
   x = 845.63