Finding the Fourth Proportional to 9,306.73, 12,805.76 and 9,085.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,306.73 : 12,805.76 = 9,085.30 : x
2. Step 2: Convert to fraction form
   9,306.73/12,805.76 = 9,085.30/x
3. Step 3: Cross multiply
   9,306.73x = 12,805.76 × 9,085.30
4. Step 4: Simplify right side
   9,306.73x = 116,344,171.33
5. Step 5: Solve for x
   x = 116,344,171.33/9,306.73
6. Step 6: Final answer
   x = 12,501.08