Finding the Fourth Proportional to 9,223.47, 12,729.56 and 8,436.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,223.47 : 12,729.56 = 8,436.15 : x
2. Step 2: Convert to fraction form
   9,223.47/12,729.56 = 8,436.15/x
3. Step 3: Cross multiply
   9,223.47x = 12,729.56 × 8,436.15
4. Step 4: Simplify right side
   9,223.47x = 107,388,435.41
5. Step 5: Solve for x
   x = 107,388,435.41/9,223.47
6. Step 6: Final answer
   x = 11,642.95