Finding the Fourth Proportional to 2,865.78, 3,956.55 and 2,201.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,865.78 : 3,956.55 = 2,201.34 : x
2. Step 2: Convert to fraction form
   2,865.78/3,956.55 = 2,201.34/x
3. Step 3: Cross multiply
   2,865.78x = 3,956.55 × 2,201.34
4. Step 4: Simplify right side
   2,865.78x = 8,709,711.78
5. Step 5: Solve for x
   x = 8,709,711.78/2,865.78
6. Step 6: Final answer
   x = 3,039.21