Finding the Fourth Proportional to 13,196.82, 18,214.56 and 8,721.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.82 : 18,214.56 = 8,721.30 : x
2. Step 2: Convert to fraction form
   13,196.82/18,214.56 = 8,721.30/x
3. Step 3: Cross multiply
   13,196.82x = 18,214.56 × 8,721.30
4. Step 4: Simplify right side
   13,196.82x = 158,854,642.13
5. Step 5: Solve for x
   x = 158,854,642.13/13,196.82
6. Step 6: Final answer
   x = 12,037.34