Finding the Fourth Proportional to 2,095.71, 3,140.85 and 861.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,095.71 : 3,140.85 = 861.72 : x
2. Step 2: Convert to fraction form
   2,095.71/3,140.85 = 861.72/x
3. Step 3: Cross multiply
   2,095.71x = 3,140.85 × 861.72
4. Step 4: Simplify right side
   2,095.71x = 2,706,533.26
5. Step 5: Solve for x
   x = 2,706,533.26/2,095.71
6. Step 6: Final answer
   x = 1,291.46