Finding the Fourth Proportional to 3,131.72, 4,322.55 and 1,806.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.72 : 4,322.55 = 1,806.22 : x
2. Step 2: Convert to fraction form
   3,131.72/4,322.55 = 1,806.22/x
3. Step 3: Cross multiply
   3,131.72x = 4,322.55 × 1,806.22
4. Step 4: Simplify right side
   3,131.72x = 7,807,476.26
5. Step 5: Solve for x
   x = 7,807,476.26/3,131.72
6. Step 6: Final answer
   x = 2,493.03