Finding the Fourth Proportional to 21,520.50, 29,698.29 and 12,089.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,520.50 : 29,698.29 = 12,089.07 : x
2. Step 2: Convert to fraction form
   21,520.50/29,698.29 = 12,089.07/x
3. Step 3: Cross multiply
   21,520.50x = 29,698.29 × 12,089.07
4. Step 4: Simplify right side
   21,520.50x = 359,024,706.69
5. Step 5: Solve for x
   x = 359,024,706.69/21,520.50
6. Step 6: Final answer
   x = 16,682.92