Finding the Fourth Proportional to 21,131.33, 29,164.39 and 13,176.11

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.33 : 29,164.39 = 13,176.11 : x
2. Step 2: Convert to fraction form
   21,131.33/29,164.39 = 13,176.11/x
3. Step 3: Cross multiply
   21,131.33x = 29,164.39 × 13,176.11
4. Step 4: Simplify right side
   21,131.33x = 384,273,250.69
5. Step 5: Solve for x
   x = 384,273,250.69/21,131.33
6. Step 6: Final answer
   x = 18,185.00