Finding the Fourth Proportional to 21,089.60, 29,092.35 and 13,912.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,089.60 : 29,092.35 = 13,912.42 : x
2. Step 2: Convert to fraction form
   21,089.60/29,092.35 = 13,912.42/x
3. Step 3: Cross multiply
   21,089.60x = 29,092.35 × 13,912.42
4. Step 4: Simplify right side
   21,089.60x = 404,744,919.26
5. Step 5: Solve for x
   x = 404,744,919.26/21,089.60
6. Step 6: Final answer
   x = 19,191.68