Finding the Fourth Proportional to 21,111.03, 29,137.15 and 13,566.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,111.03 : 29,137.15 = 13,566.79 : x
2. Step 2: Convert to fraction form
   21,111.03/29,137.15 = 13,566.79/x
3. Step 3: Cross multiply
   21,111.03x = 29,137.15 × 13,566.79
4. Step 4: Simplify right side
   21,111.03x = 395,297,648.63
5. Step 5: Solve for x
   x = 395,297,648.63/21,111.03
6. Step 6: Final answer
   x = 18,724.70