Finding the Fourth Proportional to 8,491.69, 12,738.24 and 2,648.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,491.69 : 12,738.24 = 2,648.30 : x
2. Step 2: Convert to fraction form
   8,491.69/12,738.24 = 2,648.30/x
3. Step 3: Cross multiply
   8,491.69x = 12,738.24 × 2,648.30
4. Step 4: Simplify right side
   8,491.69x = 33,734,712.84
5. Step 5: Solve for x
   x = 33,734,712.84/8,491.69
6. Step 6: Final answer
   x = 3,972.67