Finding the Fourth Proportional to 9,270.72, 12,791.52 and 5,290.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,270.72 : 12,791.52 = 5,290.56 : x
2. Step 2: Convert to fraction form
   9,270.72/12,791.52 = 5,290.56/x
3. Step 3: Cross multiply
   9,270.72x = 12,791.52 × 5,290.56
4. Step 4: Simplify right side
   9,270.72x = 67,674,304.05
5. Step 5: Solve for x
   x = 67,674,304.05/9,270.72
6. Step 6: Final answer
   x = 7,299.79