Finding the Fourth Proportional to 21,105.98, 29,113.56 and 13,935.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.98 : 29,113.56 = 13,935.96 : x
2. Step 2: Convert to fraction form
   21,105.98/29,113.56 = 13,935.96/x
3. Step 3: Cross multiply
   21,105.98x = 29,113.56 × 13,935.96
4. Step 4: Simplify right side
   21,105.98x = 405,725,407.62
5. Step 5: Solve for x
   x = 405,725,407.62/21,105.98
6. Step 6: Final answer
   x = 19,223.25