Finding the Fourth Proportional to 9,266.89, 12,789.54 and 5,287.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,266.89 : 12,789.54 = 5,287.09 : x
2. Step 2: Convert to fraction form
   9,266.89/12,789.54 = 5,287.09/x
3. Step 3: Cross multiply
   9,266.89x = 12,789.54 × 5,287.09
4. Step 4: Simplify right side
   9,266.89x = 67,619,449.04
5. Step 5: Solve for x
   x = 67,619,449.04/9,266.89
6. Step 6: Final answer
   x = 7,296.89