Finding the Fourth Proportional to 1,408.78, 1,944.03 and 779.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.78 : 1,944.03 = 779.38 : x
2. Step 2: Convert to fraction form
   1,408.78/1,944.03 = 779.38/x
3. Step 3: Cross multiply
   1,408.78x = 1,944.03 × 779.38
4. Step 4: Simplify right side
   1,408.78x = 1,515,138.10
5. Step 5: Solve for x
   x = 1,515,138.10/1,408.78
6. Step 6: Final answer
   x = 1,075.50