Finding the Fourth Proportional to 13,288.89, 18,338.42 and 7,321.11

Step by Step Solution

1. Step 1: Write the proportion equation
   13,288.89 : 18,338.42 = 7,321.11 : x
2. Step 2: Convert to fraction form
   13,288.89/18,338.42 = 7,321.11/x
3. Step 3: Cross multiply
   13,288.89x = 18,338.42 × 7,321.11
4. Step 4: Simplify right side
   13,288.89x = 134,257,608.35
5. Step 5: Solve for x
   x = 134,257,608.35/13,288.89
6. Step 6: Final answer
   x = 10,103.00