Finding the Fourth Proportional to 31,951.69, 47,933.21 and 13,221.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,951.69 : 47,933.21 = 13,221.56 : x
2. Step 2: Convert to fraction form
   31,951.69/47,933.21 = 13,221.56/x
3. Step 3: Cross multiply
   31,951.69x = 47,933.21 × 13,221.56
4. Step 4: Simplify right side
   31,951.69x = 633,751,964.89
5. Step 5: Solve for x
   x = 633,751,964.89/31,951.69
6. Step 6: Final answer
   x = 19,834.69