Finding the Fourth Proportional to 21,039.42, 29,036.97 and 12,086.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,039.42 : 29,036.97 = 12,086.91 : x
2. Step 2: Convert to fraction form
   21,039.42/29,036.97 = 12,086.91/x
3. Step 3: Cross multiply
   21,039.42x = 29,036.97 × 12,086.91
4. Step 4: Simplify right side
   21,039.42x = 350,967,097.88
5. Step 5: Solve for x
   x = 350,967,097.88/21,039.42
6. Step 6: Final answer
   x = 16,681.41