Finding the Fourth Proportional to 13,392.72, 18,482.85 and 7,728.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,392.72 : 18,482.85 = 7,728.48 : x
2. Step 2: Convert to fraction form
   13,392.72/18,482.85 = 7,728.48/x
3. Step 3: Cross multiply
   13,392.72x = 18,482.85 × 7,728.48
4. Step 4: Simplify right side
   13,392.72x = 142,844,336.57
5. Step 5: Solve for x
   x = 142,844,336.57/13,392.72
6. Step 6: Final answer
   x = 10,665.82