Finding the Fourth Proportional to 3,231.30, 4,456.26 and 2,111.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,231.30 : 4,456.26 = 2,111.88 : x
2. Step 2: Convert to fraction form
   3,231.30/4,456.26 = 2,111.88/x
3. Step 3: Cross multiply
   3,231.30x = 4,456.26 × 2,111.88
4. Step 4: Simplify right side
   3,231.30x = 9,411,086.37
5. Step 5: Solve for x
   x = 9,411,086.37/3,231.30
6. Step 6: Final answer
   x = 2,912.48