Finding the Fourth Proportional to 3,131.31, 4,321.31 and 1,805.07

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.31 : 4,321.31 = 1,805.07 : x
2. Step 2: Convert to fraction form
   3,131.31/4,321.31 = 1,805.07/x
3. Step 3: Cross multiply
   3,131.31x = 4,321.31 × 1,805.07
4. Step 4: Simplify right side
   3,131.31x = 7,800,258.02
5. Step 5: Solve for x
   x = 7,800,258.02/3,131.31
6. Step 6: Final answer
   x = 2,491.05