Finding the Fourth Proportional to 13,287.37, 18,336.72 and 7,318.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,287.37 : 18,336.72 = 7,318.91 : x
2. Step 2: Convert to fraction form
   13,287.37/18,336.72 = 7,318.91/x
3. Step 3: Cross multiply
   13,287.37x = 18,336.72 × 7,318.91
4. Step 4: Simplify right side
   13,287.37x = 134,204,766.78
5. Step 5: Solve for x
   x = 134,204,766.78/13,287.37
6. Step 6: Final answer
   x = 10,100.18