Finding the Fourth Proportional to 1,078.32, 1,488.96 and 768

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.32 : 1,488.96 = 768 : x
2. Step 2: Convert to fraction form
   1,078.32/1,488.96 = 768/x
3. Step 3: Cross multiply
   1,078.32x = 1,488.96 × 768
4. Step 4: Simplify right side
   1,078.32x = 1,143,521.28
5. Step 5: Solve for x
   x = 1,143,521.28/1,078.32
6. Step 6: Final answer
   x = 1,060.47