Finding the Fourth Proportional to 8,958.05, 12,361.25 and 5,180.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,958.05 : 12,361.25 = 5,180.91 : x
2. Step 2: Convert to fraction form
   8,958.05/12,361.25 = 5,180.91/x
3. Step 3: Cross multiply
   8,958.05x = 12,361.25 × 5,180.91
4. Step 4: Simplify right side
   8,958.05x = 64,042,497.83
5. Step 5: Solve for x
   x = 64,042,497.83/8,958.05
6. Step 6: Final answer
   x = 7,149.16