Finding the Fourth Proportional to 21,016.29, 29,005.83 and 12,954.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.29 : 29,005.83 = 12,954.69 : x
2. Step 2: Convert to fraction form
   21,016.29/29,005.83 = 12,954.69/x
3. Step 3: Cross multiply
   21,016.29x = 29,005.83 × 12,954.69
4. Step 4: Simplify right side
   21,016.29x = 375,761,535.84
5. Step 5: Solve for x
   x = 375,761,535.84/21,016.29
6. Step 6: Final answer
   x = 17,879.54