Finding the Fourth Proportional to 20,747.75, 31,109.27 and 9,656.89

Step by Step Solution

1. Step 1: Write the proportion equation
   20,747.75 : 31,109.27 = 9,656.89 : x
2. Step 2: Convert to fraction form
   20,747.75/31,109.27 = 9,656.89/x
3. Step 3: Cross multiply
   20,747.75x = 31,109.27 × 9,656.89
4. Step 4: Simplify right side
   20,747.75x = 300,418,672.31
5. Step 5: Solve for x
   x = 300,418,672.31/20,747.75
6. Step 6: Final answer
   x = 14,479.58