Finding the Fourth Proportional to 21,198.50, 31,756.38 and 10,089.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,198.50 : 31,756.38 = 10,089.92 : x
2. Step 2: Convert to fraction form
   21,198.50/31,756.38 = 10,089.92/x
3. Step 3: Cross multiply
   21,198.50x = 31,756.38 × 10,089.92
4. Step 4: Simplify right side
   21,198.50x = 320,419,333.69
5. Step 5: Solve for x
   x = 320,419,333.69/21,198.50
6. Step 6: Final answer
   x = 15,115.19