Finding the Fourth Proportional to 21,520.77, 29,697.89 and 12,089.13

Step by Step Solution

1. Step 1: Write the proportion equation
   21,520.77 : 29,697.89 = 12,089.13 : x
2. Step 2: Convert to fraction form
   21,520.77/29,697.89 = 12,089.13/x
3. Step 3: Cross multiply
   21,520.77x = 29,697.89 × 12,089.13
4. Step 4: Simplify right side
   21,520.77x = 359,021,592.49
5. Step 5: Solve for x
   x = 359,021,592.49/21,520.77
6. Step 6: Final answer
   x = 16,682.56