Finding the Fourth Proportional to 2,456.78, 3,669.53 and 2,111.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.78 : 3,669.53 = 2,111.12 : x
2. Step 2: Convert to fraction form
   2,456.78/3,669.53 = 2,111.12/x
3. Step 3: Cross multiply
   2,456.78x = 3,669.53 × 2,111.12
4. Step 4: Simplify right side
   2,456.78x = 7,746,789.27
5. Step 5: Solve for x
   x = 7,746,789.27/2,456.78
6. Step 6: Final answer
   x = 3,153.24