Finding the Fourth Proportional to 21,089.23, 29,091.83 and 13,912.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,089.23 : 29,091.83 = 13,912.04 : x
2. Step 2: Convert to fraction form
   21,089.23/29,091.83 = 13,912.04/x
3. Step 3: Cross multiply
   21,089.23x = 29,091.83 × 13,912.04
4. Step 4: Simplify right side
   21,089.23x = 404,726,705.80
5. Step 5: Solve for x
   x = 404,726,705.80/21,089.23
6. Step 6: Final answer
   x = 19,191.16