Finding the Fourth Proportional to 12,768.72, 17,620.74 and 7,179.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,768.72 : 17,620.74 = 7,179.72 : x
2. Step 2: Convert to fraction form
   12,768.72/17,620.74 = 7,179.72/x
3. Step 3: Cross multiply
   12,768.72x = 17,620.74 × 7,179.72
4. Step 4: Simplify right side
   12,768.72x = 126,511,979.39
5. Step 5: Solve for x
   x = 126,511,979.39/12,768.72
6. Step 6: Final answer
   x = 9,907.96