Finding the Fourth Proportional to 2,131.79, 3,198.07 and 961.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.79 : 3,198.07 = 961.83 : x
2. Step 2: Convert to fraction form
   2,131.79/3,198.07 = 961.83/x
3. Step 3: Cross multiply
   2,131.79x = 3,198.07 × 961.83
4. Step 4: Simplify right side
   2,131.79x = 3,076,000.87
5. Step 5: Solve for x
   x = 3,076,000.87/2,131.79
6. Step 6: Final answer
   x = 1,442.92