Finding the Fourth Proportional to 8,120.25, 12,180.42 and 2,648.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,120.25 : 12,180.42 = 2,648.25 : x
2. Step 2: Convert to fraction form
   8,120.25/12,180.42 = 2,648.25/x
3. Step 3: Cross multiply
   8,120.25x = 12,180.42 × 2,648.25
4. Step 4: Simplify right side
   8,120.25x = 32,256,797.27
5. Step 5: Solve for x
   x = 32,256,797.27/8,120.25
6. Step 6: Final answer
   x = 3,972.39