Finding the Fourth Proportional to 13,353.36, 18,429.38 and 7,688.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,353.36 : 18,429.38 = 7,688.34 : x
2. Step 2: Convert to fraction form
   13,353.36/18,429.38 = 7,688.34/x
3. Step 3: Cross multiply
   13,353.36x = 18,429.38 × 7,688.34
4. Step 4: Simplify right side
   13,353.36x = 141,691,329.82
5. Step 5: Solve for x
   x = 141,691,329.82/13,353.36
6. Step 6: Final answer
   x = 10,610.92