Finding the Fourth Proportional to 1,304.40, 1,799.82 and 780.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.40 : 1,799.82 = 780.36 : x
2. Step 2: Convert to fraction form
   1,304.40/1,799.82 = 780.36/x
3. Step 3: Cross multiply
   1,304.40x = 1,799.82 × 780.36
4. Step 4: Simplify right side
   1,304.40x = 1,404,507.54
5. Step 5: Solve for x
   x = 1,404,507.54/1,304.40
6. Step 6: Final answer
   x = 1,076.75