Finding the Fourth Proportional to 3,872.78, 5,345.27 and 2,381.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,872.78 : 5,345.27 = 2,381.96 : x
2. Step 2: Convert to fraction form
   3,872.78/5,345.27 = 2,381.96/x
3. Step 3: Cross multiply
   3,872.78x = 5,345.27 × 2,381.96
4. Step 4: Simplify right side
   3,872.78x = 12,732,219.33
5. Step 5: Solve for x
   x = 12,732,219.33/3,872.78
6. Step 6: Final answer
   x = 3,287.62