Finding the Fourth Proportional to 21,131.69, 29,160.77 and 12,180.51

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.69 : 29,160.77 = 12,180.51 : x
2. Step 2: Convert to fraction form
   21,131.69/29,160.77 = 12,180.51/x
3. Step 3: Cross multiply
   21,131.69x = 29,160.77 × 12,180.51
4. Step 4: Simplify right side
   21,131.69x = 355,192,989.69
5. Step 5: Solve for x
   x = 355,192,989.69/21,131.69
6. Step 6: Final answer
   x = 16,808.55