Finding the Fourth Proportional to 21,216.20, 31,833.51 and 8,072.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,216.20 : 31,833.51 = 8,072.33 : x
2. Step 2: Convert to fraction form
   21,216.20/31,833.51 = 8,072.33/x
3. Step 3: Cross multiply
   21,216.20x = 31,833.51 × 8,072.33
4. Step 4: Simplify right side
   21,216.20x = 256,970,408.34
5. Step 5: Solve for x
   x = 256,970,408.34/21,216.20
6. Step 6: Final answer
   x = 12,111.99