Finding the Fourth Proportional to 3,864.78, 5,800.86 and 2,811.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,864.78 : 5,800.86 = 2,811.42 : x
2. Step 2: Convert to fraction form
   3,864.78/5,800.86 = 2,811.42/x
3. Step 3: Cross multiply
   3,864.78x = 5,800.86 × 2,811.42
4. Step 4: Simplify right side
   3,864.78x = 16,308,653.82
5. Step 5: Solve for x
   x = 16,308,653.82/3,864.78
6. Step 6: Final answer
   x = 4,219.81