Finding the Fourth Proportional to 21,521.52, 29,698.56 and 12,089.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,521.52 : 29,698.56 = 12,089.76 : x
2. Step 2: Convert to fraction form
   21,521.52/29,698.56 = 12,089.76/x
3. Step 3: Cross multiply
   21,521.52x = 29,698.56 × 12,089.76
4. Step 4: Simplify right side
   21,521.52x = 359,048,462.75
5. Step 5: Solve for x
   x = 359,048,462.75/21,521.52
6. Step 6: Final answer
   x = 16,683.23