Finding the Fourth Proportional to 1,367.99, 1,887.89 and 778.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.99 : 1,887.89 = 778.61 : x
2. Step 2: Convert to fraction form
   1,367.99/1,887.89 = 778.61/x
3. Step 3: Cross multiply
   1,367.99x = 1,887.89 × 778.61
4. Step 4: Simplify right side
   1,367.99x = 1,469,920.59
5. Step 5: Solve for x
   x = 1,469,920.59/1,367.99
6. Step 6: Final answer
   x = 1,074.52