Finding the Fourth Proportional to 2,131.86, 3,198.56 and 745.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.86 : 3,198.56 = 745.40 : x
2. Step 2: Convert to fraction form
   2,131.86/3,198.56 = 745.40/x
3. Step 3: Cross multiply
   2,131.86x = 3,198.56 × 745.40
4. Step 4: Simplify right side
   2,131.86x = 2,384,206.62
5. Step 5: Solve for x
   x = 2,384,206.62/2,131.86
6. Step 6: Final answer
   x = 1,118.37