Finding the Fourth Proportional to 1,367.69, 1,887.45 and 778.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.69 : 1,887.45 = 778.21 : x
2. Step 2: Convert to fraction form
   1,367.69/1,887.45 = 778.21/x
3. Step 3: Cross multiply
   1,367.69x = 1,887.45 × 778.21
4. Step 4: Simplify right side
   1,367.69x = 1,468,829.21
5. Step 5: Solve for x
   x = 1,468,829.21/1,367.69
6. Step 6: Final answer
   x = 1,073.95