Finding the Fourth Proportional to 2,153.72, 3,231.21 and 1,114.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.72 : 3,231.21 = 1,114.31 : x
2. Step 2: Convert to fraction form
   2,153.72/3,231.21 = 1,114.31/x
3. Step 3: Cross multiply
   2,153.72x = 3,231.21 × 1,114.31
4. Step 4: Simplify right side
   2,153.72x = 3,600,569.62
5. Step 5: Solve for x
   x = 3,600,569.62/2,153.72
6. Step 6: Final answer
   x = 1,671.79