Finding the Fourth Proportional to 21,081.99, 29,096.24 and 12,698.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,081.99 : 29,096.24 = 12,698.31 : x
2. Step 2: Convert to fraction form
   21,081.99/29,096.24 = 12,698.31/x
3. Step 3: Cross multiply
   21,081.99x = 29,096.24 × 12,698.31
4. Step 4: Simplify right side
   21,081.99x = 369,473,011.86
5. Step 5: Solve for x
   x = 369,473,011.86/21,081.99
6. Step 6: Final answer
   x = 17,525.53