Finding the Fourth Proportional to 9,269.31, 12,791.43 and 5,290.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,269.31 : 12,791.43 = 5,290.05 : x
2. Step 2: Convert to fraction form
   9,269.31/12,791.43 = 5,290.05/x
3. Step 3: Cross multiply
   9,269.31x = 12,791.43 × 5,290.05
4. Step 4: Simplify right side
   9,269.31x = 67,667,304.27
5. Step 5: Solve for x
   x = 67,667,304.27/9,269.31
6. Step 6: Final answer
   x = 7,300.14