Finding the Fourth Proportional to 1,078.80, 1,488.72 and 606.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.80 : 1,488.72 = 606.78 : x
2. Step 2: Convert to fraction form
   1,078.80/1,488.72 = 606.78/x
3. Step 3: Cross multiply
   1,078.80x = 1,488.72 × 606.78
4. Step 4: Simplify right side
   1,078.80x = 903,325.52
5. Step 5: Solve for x
   x = 903,325.52/1,078.80
6. Step 6: Final answer
   x = 837.34