Finding the Fourth Proportional to 1,367.94, 1,887.86 and 778.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.94 : 1,887.86 = 778.67 : x
2. Step 2: Convert to fraction form
   1,367.94/1,887.86 = 778.67/x
3. Step 3: Cross multiply
   1,367.94x = 1,887.86 × 778.67
4. Step 4: Simplify right side
   1,367.94x = 1,470,006.61
5. Step 5: Solve for x
   x = 1,470,006.61/1,367.94
6. Step 6: Final answer
   x = 1,074.61