Finding the Fourth Proportional to 2,159.56, 3,240.42 and 861.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.56 : 3,240.42 = 861.94 : x
2. Step 2: Convert to fraction form
   2,159.56/3,240.42 = 861.94/x
3. Step 3: Cross multiply
   2,159.56x = 3,240.42 × 861.94
4. Step 4: Simplify right side
   2,159.56x = 2,793,047.61
5. Step 5: Solve for x
   x = 2,793,047.61/2,159.56
6. Step 6: Final answer
   x = 1,293.34