Finding the Fourth Proportional to 9,265.89, 12,788.16 and 5,286.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,265.89 : 12,788.16 = 5,286.09 : x
2. Step 2: Convert to fraction form
   9,265.89/12,788.16 = 5,286.09/x
3. Step 3: Cross multiply
   9,265.89x = 12,788.16 × 5,286.09
4. Step 4: Simplify right side
   9,265.89x = 67,599,364.69
5. Step 5: Solve for x
   x = 67,599,364.69/9,265.89
6. Step 6: Final answer
   x = 7,295.51