Finding the Fourth Proportional to 13,616.24, 18,789.72 and 7,648.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,616.24 : 18,789.72 = 7,648.16 : x
2. Step 2: Convert to fraction form
   13,616.24/18,789.72 = 7,648.16/x
3. Step 3: Cross multiply
   13,616.24x = 18,789.72 × 7,648.16
4. Step 4: Simplify right side
   13,616.24x = 143,706,784.92
5. Step 5: Solve for x
   x = 143,706,784.92/13,616.24
6. Step 6: Final answer
   x = 10,554.07