Finding the Fourth Proportional to 21,109.33, 31,672.50 and 7,965.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.33 : 31,672.50 = 7,965.46 : x
2. Step 2: Convert to fraction form
   21,109.33/31,672.50 = 7,965.46/x
3. Step 3: Cross multiply
   21,109.33x = 31,672.50 × 7,965.46
4. Step 4: Simplify right side
   21,109.33x = 252,286,031.85
5. Step 5: Solve for x
   x = 252,286,031.85/21,109.33
6. Step 6: Final answer
   x = 11,951.40