Finding the Fourth Proportional to 13,099.76, 18,083.86 and 8,386.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,099.76 : 18,083.86 = 8,386.76 : x
2. Step 2: Convert to fraction form
   13,099.76/18,083.86 = 8,386.76/x
3. Step 3: Cross multiply
   13,099.76x = 18,083.86 × 8,386.76
4. Step 4: Simplify right side
   13,099.76x = 151,664,993.69
5. Step 5: Solve for x
   x = 151,664,993.69/13,099.76
6. Step 6: Final answer
   x = 11,577.69