Finding the Fourth Proportional to 1,304.32, 1,799.79 and 780.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.32 : 1,799.79 = 780.28 : x
2. Step 2: Convert to fraction form
   1,304.32/1,799.79 = 780.28/x
3. Step 3: Cross multiply
   1,304.32x = 1,799.79 × 780.28
4. Step 4: Simplify right side
   1,304.32x = 1,404,340.14
5. Step 5: Solve for x
   x = 1,404,340.14/1,304.32
6. Step 6: Final answer
   x = 1,076.68