Finding the Fourth Proportional to 13,308.69, 18,365.37 and 7,639.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,308.69 : 18,365.37 = 7,639.50 : x
2. Step 2: Convert to fraction form
   13,308.69/18,365.37 = 7,639.50/x
3. Step 3: Cross multiply
   13,308.69x = 18,365.37 × 7,639.50
4. Step 4: Simplify right side
   13,308.69x = 140,302,244.12
5. Step 5: Solve for x
   x = 140,302,244.12/13,308.69
6. Step 6: Final answer
   x = 10,542.15