Finding the Fourth Proportional to 21,019.63, 29,018.97 and 13,955.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.63 : 29,018.97 = 13,955.71 : x
2. Step 2: Convert to fraction form
   21,019.63/29,018.97 = 13,955.71/x
3. Step 3: Cross multiply
   21,019.63x = 29,018.97 × 13,955.71
4. Step 4: Simplify right side
   21,019.63x = 404,980,329.82
5. Step 5: Solve for x
   x = 404,980,329.82/21,019.63
6. Step 6: Final answer
   x = 19,266.77