Finding the Fourth Proportional to 11,978.08, 17,960.64 and 4,078.24

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.08 : 17,960.64 = 4,078.24 : x
2. Step 2: Convert to fraction form
   11,978.08/17,960.64 = 4,078.24/x
3. Step 3: Cross multiply
   11,978.08x = 17,960.64 × 4,078.24
4. Step 4: Simplify right side
   11,978.08x = 73,247,800.47
5. Step 5: Solve for x
   x = 73,247,800.47/11,978.08
6. Step 6: Final answer
   x = 6,115.15