Finding the Fourth Proportional to 1,304.31, 1,799.42 and 780.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.31 : 1,799.42 = 780.33 : x
2. Step 2: Convert to fraction form
   1,304.31/1,799.42 = 780.33/x
3. Step 3: Cross multiply
   1,304.31x = 1,799.42 × 780.33
4. Step 4: Simplify right side
   1,304.31x = 1,404,137.51
5. Step 5: Solve for x
   x = 1,404,137.51/1,304.31
6. Step 6: Final answer
   x = 1,076.54