Finding the Fourth Proportional to 12,808.50, 17,690.31 and 8,609.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808.50 : 17,690.31 = 8,609.46 : x
2. Step 2: Convert to fraction form
   12,808.50/17,690.31 = 8,609.46/x
3. Step 3: Cross multiply
   12,808.50x = 17,690.31 × 8,609.46
4. Step 4: Simplify right side
   12,808.50x = 152,304,016.33
5. Step 5: Solve for x
   x = 152,304,016.33/12,808.50
6. Step 6: Final answer
   x = 11,890.86