Finding the Fourth Proportional to 21,109.38, 31,674.69 and 7,961.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.38 : 31,674.69 = 7,961.82 : x
2. Step 2: Convert to fraction form
   21,109.38/31,674.69 = 7,961.82/x
3. Step 3: Cross multiply
   21,109.38x = 31,674.69 × 7,961.82
4. Step 4: Simplify right side
   21,109.38x = 252,188,180.34
5. Step 5: Solve for x
   x = 252,188,180.34/21,109.38
6. Step 6: Final answer
   x = 11,946.74