Finding the Fourth Proportional to 1,367.72, 1,887.48 and 778.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.72 : 1,887.48 = 778.28 : x
2. Step 2: Convert to fraction form
   1,367.72/1,887.48 = 778.28/x
3. Step 3: Cross multiply
   1,367.72x = 1,887.48 × 778.28
4. Step 4: Simplify right side
   1,367.72x = 1,468,987.93
5. Step 5: Solve for x
   x = 1,468,987.93/1,367.72
6. Step 6: Final answer
   x = 1,074.04