Finding the Fourth Proportional to 2,131.04, 3,195.78 and 961.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.04 : 3,195.78 = 961.40 : x
2. Step 2: Convert to fraction form
   2,131.04/3,195.78 = 961.40/x
3. Step 3: Cross multiply
   2,131.04x = 3,195.78 × 961.40
4. Step 4: Simplify right side
   2,131.04x = 3,072,422.89
5. Step 5: Solve for x
   x = 3,072,422.89/2,131.04
6. Step 6: Final answer
   x = 1,441.75