Finding the Fourth Proportional to 13,218.69, 18,243.41 and 7,629.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,218.69 : 18,243.41 = 7,629.69 : x
2. Step 2: Convert to fraction form
   13,218.69/18,243.41 = 7,629.69/x
3. Step 3: Cross multiply
   13,218.69x = 18,243.41 × 7,629.69
4. Step 4: Simplify right side
   13,218.69x = 139,191,517.23
5. Step 5: Solve for x
   x = 139,191,517.23/13,218.69
6. Step 6: Final answer
   x = 10,529.90