Finding the Fourth Proportional to 21,231.39, 31,855.86 and 10,695.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,231.39 : 31,855.86 = 10,695.72 : x
2. Step 2: Convert to fraction form
   21,231.39/31,855.86 = 10,695.72/x
3. Step 3: Cross multiply
   21,231.39x = 31,855.86 × 10,695.72
4. Step 4: Simplify right side
   21,231.39x = 340,721,358.92
5. Step 5: Solve for x
   x = 340,721,358.92/21,231.39
6. Step 6: Final answer
   x = 16,048.00