Finding the Fourth Proportional to 3,419.49, 5,131.71 and 2,189.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,419.49 : 5,131.71 = 2,189.91 : x
2. Step 2: Convert to fraction form
   3,419.49/5,131.71 = 2,189.91/x
3. Step 3: Cross multiply
   3,419.49x = 5,131.71 × 2,189.91
4. Step 4: Simplify right side
   3,419.49x = 11,237,983.05
5. Step 5: Solve for x
   x = 11,237,983.05/3,419.49
6. Step 6: Final answer
   x = 3,286.45