Finding the Fourth Proportional to 8,786.16, 12,127.98 and 5,431.54

Step by Step Solution

1. Step 1: Write the proportion equation
   8,786.16 : 12,127.98 = 5,431.54 : x
2. Step 2: Convert to fraction form
   8,786.16/12,127.98 = 5,431.54/x
3. Step 3: Cross multiply
   8,786.16x = 12,127.98 × 5,431.54
4. Step 4: Simplify right side
   8,786.16x = 65,873,608.49
5. Step 5: Solve for x
   x = 65,873,608.49/8,786.16
6. Step 6: Final answer
   x = 7,497.43