Finding the Fourth Proportional to 21,520.69, 29,698.56 and 12,089.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,520.69 : 29,698.56 = 12,089.25 : x
2. Step 2: Convert to fraction form
   21,520.69/29,698.56 = 12,089.25/x
3. Step 3: Cross multiply
   21,520.69x = 29,698.56 × 12,089.25
4. Step 4: Simplify right side
   21,520.69x = 359,033,316.48
5. Step 5: Solve for x
   x = 359,033,316.48/21,520.69
6. Step 6: Final answer
   x = 16,683.17