Finding the Fourth Proportional to 21,281.02, 31,920.31 and 8,134.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,281.02 : 31,920.31 = 8,134.72 : x
2. Step 2: Convert to fraction form
   21,281.02/31,920.31 = 8,134.72/x
3. Step 3: Cross multiply
   21,281.02x = 31,920.31 × 8,134.72
4. Step 4: Simplify right side
   21,281.02x = 259,662,604.22
5. Step 5: Solve for x
   x = 259,662,604.22/21,281.02
6. Step 6: Final answer
   x = 12,201.61