Finding the Fourth Proportional to 3,943.56, 5,909.76 and 2,189.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,943.56 : 5,909.76 = 2,189.34 : x
2. Step 2: Convert to fraction form
   3,943.56/5,909.76 = 2,189.34/x
3. Step 3: Cross multiply
   3,943.56x = 5,909.76 × 2,189.34
4. Step 4: Simplify right side
   3,943.56x = 12,938,473.96
5. Step 5: Solve for x
   x = 12,938,473.96/3,943.56
6. Step 6: Final answer
   x = 3,280.91