Finding the Fourth Proportional to 12,648.42, 18,936.99 and 7,091.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,648.42 : 18,936.99 = 7,091.82 : x
2. Step 2: Convert to fraction form
   12,648.42/18,936.99 = 7,091.82/x
3. Step 3: Cross multiply
   12,648.42x = 18,936.99 × 7,091.82
4. Step 4: Simplify right side
   12,648.42x = 134,297,724.42
5. Step 5: Solve for x
   x = 134,297,724.42/12,648.42
6. Step 6: Final answer
   x = 10,617.75