Finding the Fourth Proportional to 8,904, 12,288.24 and 5,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,904 : 12,288.24 = 5,178.72 : x
2. Step 2: Convert to fraction form
   8,904/12,288.24 = 5,178.72/x
3. Step 3: Cross multiply
   8,904x = 12,288.24 × 5,178.72
4. Step 4: Simplify right side
   8,904x = 63,637,354.25
5. Step 5: Solve for x
   x = 63,637,354.25/8,904
6. Step 6: Final answer
   x = 7,147.05