Finding the Fourth Proportional to 1,367.78, 1,887.36 and 778.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.78 : 1,887.36 = 778.38 : x
2. Step 2: Convert to fraction form
   1,367.78/1,887.36 = 778.38/x
3. Step 3: Cross multiply
   1,367.78x = 1,887.36 × 778.38
4. Step 4: Simplify right side
   1,367.78x = 1,469,083.28
5. Step 5: Solve for x
   x = 1,469,083.28/1,367.78
6. Step 6: Final answer
   x = 1,074.06