Finding the Fourth Proportional to 3,131.49, 4,321.62 and 1,805.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.49 : 4,321.62 = 1,805.34 : x
2. Step 2: Convert to fraction form
   3,131.49/4,321.62 = 1,805.34/x
3. Step 3: Cross multiply
   3,131.49x = 4,321.62 × 1,805.34
4. Step 4: Simplify right side
   3,131.49x = 7,801,993.45
5. Step 5: Solve for x
   x = 7,801,993.45/3,131.49
6. Step 6: Final answer
   x = 2,491.46