Finding the Fourth Proportional to 3,131.22, 4,321.86 and 1,805.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.22 : 4,321.86 = 1,805.72 : x
2. Step 2: Convert to fraction form
   3,131.22/4,321.86 = 1,805.72/x
3. Step 3: Cross multiply
   3,131.22x = 4,321.86 × 1,805.72
4. Step 4: Simplify right side
   3,131.22x = 7,804,069.04
5. Step 5: Solve for x
   x = 7,804,069.04/3,131.22
6. Step 6: Final answer
   x = 2,492.34