Finding the Fourth Proportional to 9,009.17, 12,441.21 and 8,518.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,009.17 : 12,441.21 = 8,518.31 : x
2. Step 2: Convert to fraction form
   9,009.17/12,441.21 = 8,518.31/x
3. Step 3: Cross multiply
   9,009.17x = 12,441.21 × 8,518.31
4. Step 4: Simplify right side
   9,009.17x = 105,978,083.56
5. Step 5: Solve for x
   x = 105,978,083.56/9,009.17
6. Step 6: Final answer
   x = 11,763.36