Finding the Fourth Proportional to 21,196.39, 29,245.03 and 13,647.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.39 : 29,245.03 = 13,647.09 : x
2. Step 2: Convert to fraction form
   21,196.39/29,245.03 = 13,647.09/x
3. Step 3: Cross multiply
   21,196.39x = 29,245.03 × 13,647.09
4. Step 4: Simplify right side
   21,196.39x = 399,109,467.51
5. Step 5: Solve for x
   x = 399,109,467.51/21,196.39
6. Step 6: Final answer
   x = 18,829.13