Finding the Fourth Proportional to 21,139.06, 29,171.83 and 12,186.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,139.06 : 29,171.83 = 12,186.52 : x
2. Step 2: Convert to fraction form
   21,139.06/29,171.83 = 12,186.52/x
3. Step 3: Cross multiply
   21,139.06x = 29,171.83 × 12,186.52
4. Step 4: Simplify right side
   21,139.06x = 355,503,089.73
5. Step 5: Solve for x
   x = 355,503,089.73/21,139.06
6. Step 6: Final answer
   x = 16,817.36