Finding the Fourth Proportional to 1,408.42, 1,943.72 and 779.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.42 : 1,943.72 = 779.05 : x
2. Step 2: Convert to fraction form
   1,408.42/1,943.72 = 779.05/x
3. Step 3: Cross multiply
   1,408.42x = 1,943.72 × 779.05
4. Step 4: Simplify right side
   1,408.42x = 1,514,255.07
5. Step 5: Solve for x
   x = 1,514,255.07/1,408.42
6. Step 6: Final answer
   x = 1,075.14