Finding the Fourth Proportional to 20,806.24, 31,221.69 and 7,667.83

Step by Step Solution

1. Step 1: Write the proportion equation
   20,806.24 : 31,221.69 = 7,667.83 : x
2. Step 2: Convert to fraction form
   20,806.24/31,221.69 = 7,667.83/x
3. Step 3: Cross multiply
   20,806.24x = 31,221.69 × 7,667.83
4. Step 4: Simplify right side
   20,806.24x = 239,402,611.23
5. Step 5: Solve for x
   x = 239,402,611.23/20,806.24
6. Step 6: Final answer
   x = 11,506.29