Finding the Fourth Proportional to 1,367.21, 1,886.42 and 778.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.21 : 1,886.42 = 778.07 : x
2. Step 2: Convert to fraction form
   1,367.21/1,886.42 = 778.07/x
3. Step 3: Cross multiply
   1,367.21x = 1,886.42 × 778.07
4. Step 4: Simplify right side
   1,367.21x = 1,467,757.38
5. Step 5: Solve for x
   x = 1,467,757.38/1,367.21
6. Step 6: Final answer
   x = 1,073.55