Finding the Fourth Proportional to 13,115.37, 18,099.59 and 7,449.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,115.37 : 18,099.59 = 7,449.78 : x
2. Step 2: Convert to fraction form
   13,115.37/18,099.59 = 7,449.78/x
3. Step 3: Cross multiply
   13,115.37x = 18,099.59 × 7,449.78
4. Step 4: Simplify right side
   13,115.37x = 134,837,963.59
5. Step 5: Solve for x
   x = 134,837,963.59/13,115.37
6. Step 6: Final answer
   x = 10,280.91