Finding the Fourth Proportional to 8,904.24, 12,288.72 and 5,178

Step by Step Solution

1. Step 1: Write the proportion equation
   8,904.24 : 12,288.72 = 5,178 : x
2. Step 2: Convert to fraction form
   8,904.24/12,288.72 = 5,178/x
3. Step 3: Cross multiply
   8,904.24x = 12,288.72 × 5,178
4. Step 4: Simplify right side
   8,904.24x = 63,630,992.16
5. Step 5: Solve for x
   x = 63,630,992.16/8,904.24
6. Step 6: Final answer
   x = 7,146.15