Finding the Fourth Proportional to 2,631.15, 3,939.98 and 2,553.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.15 : 3,939.98 = 2,553.29 : x
2. Step 2: Convert to fraction form
   2,631.15/3,939.98 = 2,553.29/x
3. Step 3: Cross multiply
   2,631.15x = 3,939.98 × 2,553.29
4. Step 4: Simplify right side
   2,631.15x = 10,059,911.53
5. Step 5: Solve for x
   x = 10,059,911.53/2,631.15
6. Step 6: Final answer
   x = 3,823.39