Finding the Fourth Proportional to 21,019.88, 29,019.30 and 13,955.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.88 : 29,019.30 = 13,955.96 : x
2. Step 2: Convert to fraction form
   21,019.88/29,019.30 = 13,955.96/x
3. Step 3: Cross multiply
   21,019.88x = 29,019.30 × 13,955.96
4. Step 4: Simplify right side
   21,019.88x = 404,992,190.03
5. Step 5: Solve for x
   x = 404,992,190.03/21,019.88
6. Step 6: Final answer
   x = 19,267.10