Finding the Fourth Proportional to 13,329.18, 18,391.86 and 7,662.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,329.18 : 18,391.86 = 7,662.60 : x
2. Step 2: Convert to fraction form
   13,329.18/18,391.86 = 7,662.60/x
3. Step 3: Cross multiply
   13,329.18x = 18,391.86 × 7,662.60
4. Step 4: Simplify right side
   13,329.18x = 140,929,466.44
5. Step 5: Solve for x
   x = 140,929,466.44/13,329.18
6. Step 6: Final answer
   x = 10,573.00