Finding the Fourth Proportional to 3,522.78, 4,862.31 and 2,178.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,522.78 : 4,862.31 = 2,178.78 : x
2. Step 2: Convert to fraction form
   3,522.78/4,862.31 = 2,178.78/x
3. Step 3: Cross multiply
   3,522.78x = 4,862.31 × 2,178.78
4. Step 4: Simplify right side
   3,522.78x = 10,593,903.78
5. Step 5: Solve for x
   x = 10,593,903.78/3,522.78
6. Step 6: Final answer
   x = 3,007.26