Finding the Fourth Proportional to 21,149.34, 31,724.37 and 8,007.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,149.34 : 31,724.37 = 8,007.90 : x
2. Step 2: Convert to fraction form
   21,149.34/31,724.37 = 8,007.90/x
3. Step 3: Cross multiply
   21,149.34x = 31,724.37 × 8,007.90
4. Step 4: Simplify right side
   21,149.34x = 254,045,582.52
5. Step 5: Solve for x
   x = 254,045,582.52/21,149.34
6. Step 6: Final answer
   x = 12,011.99