Finding the Fourth Proportional to 13,099.34, 18,072.38 and 8,625.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,099.34 : 18,072.38 = 8,625.72 : x
2. Step 2: Convert to fraction form
   13,099.34/18,072.38 = 8,625.72/x
3. Step 3: Cross multiply
   13,099.34x = 18,072.38 × 8,625.72
4. Step 4: Simplify right side
   13,099.34x = 155,887,289.61
5. Step 5: Solve for x
   x = 155,887,289.61/13,099.34
6. Step 6: Final answer
   x = 11,900.39