Finding the Fourth Proportional to 7,321.78, 10,104.78 and 4,178.44

Step by Step Solution

1. Step 1: Write the proportion equation
   7,321.78 : 10,104.78 = 4,178.44 : x
2. Step 2: Convert to fraction form
   7,321.78/10,104.78 = 4,178.44/x
3. Step 3: Cross multiply
   7,321.78x = 10,104.78 × 4,178.44
4. Step 4: Simplify right side
   7,321.78x = 42,222,216.94
5. Step 5: Solve for x
   x = 42,222,216.94/7,321.78
6. Step 6: Final answer
   x = 5,766.66