Finding the Fourth Proportional to 1,367.69, 1,887.74 and 778.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.69 : 1,887.74 = 778.56 : x
2. Step 2: Convert to fraction form
   1,367.69/1,887.74 = 778.56/x
3. Step 3: Cross multiply
   1,367.69x = 1,887.74 × 778.56
4. Step 4: Simplify right side
   1,367.69x = 1,469,720.80
5. Step 5: Solve for x
   x = 1,469,720.80/1,367.69
6. Step 6: Final answer
   x = 1,074.60