Finding the Fourth Proportional to 13,411.36, 18,501.89 and 8,103.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,411.36 : 18,501.89 = 8,103.09 : x
2. Step 2: Convert to fraction form
   13,411.36/18,501.89 = 8,103.09/x
3. Step 3: Cross multiply
   13,411.36x = 18,501.89 × 8,103.09
4. Step 4: Simplify right side
   13,411.36x = 149,922,508.71
5. Step 5: Solve for x
   x = 149,922,508.71/13,411.36
6. Step 6: Final answer
   x = 11,178.77