Finding the Fourth Proportional to 3,131.86, 4,321.96 and 1,805.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.86 : 4,321.96 = 1,805.56 : x
2. Step 2: Convert to fraction form
   3,131.86/4,321.96 = 1,805.56/x
3. Step 3: Cross multiply
   3,131.86x = 4,321.96 × 1,805.56
4. Step 4: Simplify right side
   3,131.86x = 7,803,558.10
5. Step 5: Solve for x
   x = 7,803,558.10/3,131.86
6. Step 6: Final answer
   x = 2,491.67