Finding the Fourth Proportional to 21,079.89, 29,076.98 and 13,518.27

Step by Step Solution

1. Step 1: Write the proportion equation
   21,079.89 : 29,076.98 = 13,518.27 : x
2. Step 2: Convert to fraction form
   21,079.89/29,076.98 = 13,518.27/x
3. Step 3: Cross multiply
   21,079.89x = 29,076.98 × 13,518.27
4. Step 4: Simplify right side
   21,079.89x = 393,070,398.83
5. Step 5: Solve for x
   x = 393,070,398.83/21,079.89
6. Step 6: Final answer
   x = 18,646.70