Finding the Fourth Proportional to 11,223.42, 15,481.35 and 8,982.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,223.42 : 15,481.35 = 8,982.78 : x
2. Step 2: Convert to fraction form
   11,223.42/15,481.35 = 8,982.78/x
3. Step 3: Cross multiply
   11,223.42x = 15,481.35 × 8,982.78
4. Step 4: Simplify right side
   11,223.42x = 139,065,561.15
5. Step 5: Solve for x
   x = 139,065,561.15/11,223.42
6. Step 6: Final answer
   x = 12,390.66