Finding the Fourth Proportional to 8,667.45, 11,958.71 and 5,521.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.45 : 11,958.71 = 5,521.05 : x
2. Step 2: Convert to fraction form
   8,667.45/11,958.71 = 5,521.05/x
3. Step 3: Cross multiply
   8,667.45x = 11,958.71 × 5,521.05
4. Step 4: Simplify right side
   8,667.45x = 66,024,608.24
5. Step 5: Solve for x
   x = 66,024,608.24/8,667.45
6. Step 6: Final answer
   x = 7,617.54