Finding the Fourth Proportional to 2,131.78, 3,198.48 and 745.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.78 : 3,198.48 = 745.27 : x
2. Step 2: Convert to fraction form
   2,131.78/3,198.48 = 745.27/x
3. Step 3: Cross multiply
   2,131.78x = 3,198.48 × 745.27
4. Step 4: Simplify right side
   2,131.78x = 2,383,731.19
5. Step 5: Solve for x
   x = 2,383,731.19/2,131.78
6. Step 6: Final answer
   x = 1,118.19