Finding the Fourth Proportional to 2,171.78, 3,241.94 and 1,909.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.78 : 3,241.94 = 1,909.03 : x
2. Step 2: Convert to fraction form
   2,171.78/3,241.94 = 1,909.03/x
3. Step 3: Cross multiply
   2,171.78x = 3,241.94 × 1,909.03
4. Step 4: Simplify right side
   2,171.78x = 6,188,960.72
5. Step 5: Solve for x
   x = 6,188,960.72/2,171.78
6. Step 6: Final answer
   x = 2,849.72