Finding the Fourth Proportional to 1,362.78, 2,042.34 and 712.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.78 : 2,042.34 = 712.20 : x
2. Step 2: Convert to fraction form
   1,362.78/2,042.34 = 712.20/x
3. Step 3: Cross multiply
   1,362.78x = 2,042.34 × 712.20
4. Step 4: Simplify right side
   1,362.78x = 1,454,554.55
5. Step 5: Solve for x
   x = 1,454,554.55/1,362.78
6. Step 6: Final answer
   x = 1,067.34