Finding the Fourth Proportional to 21,017.88, 29,016.54 and 13,953.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,017.88 : 29,016.54 = 13,953.96 : x
2. Step 2: Convert to fraction form
   21,017.88/29,016.54 = 13,953.96/x
3. Step 3: Cross multiply
   21,017.88x = 29,016.54 × 13,953.96
4. Step 4: Simplify right side
   21,017.88x = 404,895,638.50
5. Step 5: Solve for x
   x = 404,895,638.50/21,017.88
6. Step 6: Final answer
   x = 19,264.34