Finding the Fourth Proportional to 2,311.57, 3,191.43 and 1,781.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.57 : 3,191.43 = 1,781.56 : x
2. Step 2: Convert to fraction form
   2,311.57/3,191.43 = 1,781.56/x
3. Step 3: Cross multiply
   2,311.57x = 3,191.43 × 1,781.56
4. Step 4: Simplify right side
   2,311.57x = 5,685,724.03
5. Step 5: Solve for x
   x = 5,685,724.03/2,311.57
6. Step 6: Final answer
   x = 2,459.68