Finding the Fourth Proportional to 1,367.91, 1,887.62 and 778.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.91 : 1,887.62 = 778.43 : x
2. Step 2: Convert to fraction form
   1,367.91/1,887.62 = 778.43/x
3. Step 3: Cross multiply
   1,367.91x = 1,887.62 × 778.43
4. Step 4: Simplify right side
   1,367.91x = 1,469,366.71
5. Step 5: Solve for x
   x = 1,469,366.71/1,367.91
6. Step 6: Final answer
   x = 1,074.17