Finding the Fourth Proportional to 21,222.21, 31,828.38 and 7,901.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,222.21 : 31,828.38 = 7,901.49 : x
2. Step 2: Convert to fraction form
   21,222.21/31,828.38 = 7,901.49/x
3. Step 3: Cross multiply
   21,222.21x = 31,828.38 × 7,901.49
4. Step 4: Simplify right side
   21,222.21x = 251,491,581.42
5. Step 5: Solve for x
   x = 251,491,581.42/21,222.21
6. Step 6: Final answer
   x = 11,850.39