Finding the Fourth Proportional to 21,522.40, 29,699.22 and 12,089.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,522.40 : 29,699.22 = 12,089.20 : x
2. Step 2: Convert to fraction form
   21,522.40/29,699.22 = 12,089.20/x
3. Step 3: Cross multiply
   21,522.40x = 29,699.22 × 12,089.20
4. Step 4: Simplify right side
   21,522.40x = 359,039,810.42
5. Step 5: Solve for x
   x = 359,039,810.42/21,522.40
6. Step 6: Final answer
   x = 16,682.15