Finding the Fourth Proportional to 8,978.15, 12,362.78 and 8,452.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.15 : 12,362.78 = 8,452.12 : x
2. Step 2: Convert to fraction form
   8,978.15/12,362.78 = 8,452.12/x
3. Step 3: Cross multiply
   8,978.15x = 12,362.78 × 8,452.12
4. Step 4: Simplify right side
   8,978.15x = 104,491,700.09
5. Step 5: Solve for x
   x = 104,491,700.09/8,978.15
6. Step 6: Final answer
   x = 11,638.44