Finding the Fourth Proportional to 2,085.72, 2,872.45 and 2,040.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.72 : 2,872.45 = 2,040.36 : x
2. Step 2: Convert to fraction form
   2,085.72/2,872.45 = 2,040.36/x
3. Step 3: Cross multiply
   2,085.72x = 2,872.45 × 2,040.36
4. Step 4: Simplify right side
   2,085.72x = 5,860,832.08
5. Step 5: Solve for x
   x = 5,860,832.08/2,085.72
6. Step 6: Final answer
   x = 2,809.98