Finding the Fourth Proportional to 8,120.56, 12,180.72 and 2,648.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,120.56 : 12,180.72 = 2,648.56 : x
2. Step 2: Convert to fraction form
   8,120.56/12,180.72 = 2,648.56/x
3. Step 3: Cross multiply
   8,120.56x = 12,180.72 × 2,648.56
4. Step 4: Simplify right side
   8,120.56x = 32,261,367.76
5. Step 5: Solve for x
   x = 32,261,367.76/8,120.56
6. Step 6: Final answer
   x = 3,972.80