Finding the Fourth Proportional to 13,287.09, 18,335.33 and 7,318.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,287.09 : 18,335.33 = 7,318.72 : x
2. Step 2: Convert to fraction form
   13,287.09/18,335.33 = 7,318.72/x
3. Step 3: Cross multiply
   13,287.09x = 18,335.33 × 7,318.72
4. Step 4: Simplify right side
   13,287.09x = 134,191,160.15
5. Step 5: Solve for x
   x = 134,191,160.15/13,287.09
6. Step 6: Final answer
   x = 10,099.37