Finding the Fourth Proportional to 21,018.63, 29,017.59 and 13,954.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.63 : 29,017.59 = 13,954.71 : x
2. Step 2: Convert to fraction form
   21,018.63/29,017.59 = 13,954.71/x
3. Step 3: Cross multiply
   21,018.63x = 29,017.59 × 13,954.71
4. Step 4: Simplify right side
   21,018.63x = 404,932,053.35
5. Step 5: Solve for x
   x = 404,932,053.35/21,018.63
6. Step 6: Final answer
   x = 19,265.39