Finding the Fourth Proportional to 1,288.32, 1,932.56 and 518.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.32 : 1,932.56 = 518.88 : x
2. Step 2: Convert to fraction form
   1,288.32/1,932.56 = 518.88/x
3. Step 3: Cross multiply
   1,288.32x = 1,932.56 × 518.88
4. Step 4: Simplify right side
   1,288.32x = 1,002,766.73
5. Step 5: Solve for x
   x = 1,002,766.73/1,288.32
6. Step 6: Final answer
   x = 778.35