Finding the Fourth Proportional to 2,157.57, 3,233.98 and 1,231.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.57 : 3,233.98 = 1,231.11 : x
2. Step 2: Convert to fraction form
   2,157.57/3,233.98 = 1,231.11/x
3. Step 3: Cross multiply
   2,157.57x = 3,233.98 × 1,231.11
4. Step 4: Simplify right side
   2,157.57x = 3,981,372.03
5. Step 5: Solve for x
   x = 3,981,372.03/2,157.57
6. Step 6: Final answer
   x = 1,845.31