Finding the Fourth Proportional to 21,520.89, 29,698.65 and 12,089.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,520.89 : 29,698.65 = 12,089.25 : x
2. Step 2: Convert to fraction form
   21,520.89/29,698.65 = 12,089.25/x
3. Step 3: Cross multiply
   21,520.89x = 29,698.65 × 12,089.25
4. Step 4: Simplify right side
   21,520.89x = 359,034,404.51
5. Step 5: Solve for x
   x = 359,034,404.51/21,520.89
6. Step 6: Final answer
   x = 16,683.06