Finding the Fourth Proportional to 1,077.78, 1,488.96 and 960.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.78 : 1,488.96 = 960.18 : x
2. Step 2: Convert to fraction form
   1,077.78/1,488.96 = 960.18/x
3. Step 3: Cross multiply
   1,077.78x = 1,488.96 × 960.18
4. Step 4: Simplify right side
   1,077.78x = 1,429,669.61
5. Step 5: Solve for x
   x = 1,429,669.61/1,077.78
6. Step 6: Final answer
   x = 1,326.49