Finding the Fourth Proportional to 21,065.82, 29,072.78 and 12,118.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,065.82 : 29,072.78 = 12,118.56 : x
2. Step 2: Convert to fraction form
   21,065.82/29,072.78 = 12,118.56/x
3. Step 3: Cross multiply
   21,065.82x = 29,072.78 × 12,118.56
4. Step 4: Simplify right side
   21,065.82x = 352,320,228.80
5. Step 5: Solve for x
   x = 352,320,228.80/21,065.82
6. Step 6: Final answer
   x = 16,724.73