Finding the Fourth Proportional to 1,367.69, 1,887.37 and 778.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.69 : 1,887.37 = 778.15 : x
2. Step 2: Convert to fraction form
   1,367.69/1,887.37 = 778.15/x
3. Step 3: Cross multiply
   1,367.69x = 1,887.37 × 778.15
4. Step 4: Simplify right side
   1,367.69x = 1,468,656.97
5. Step 5: Solve for x
   x = 1,468,656.97/1,367.69
6. Step 6: Final answer
   x = 1,073.82