Finding the Fourth Proportional to 9,269.43, 12,790.58 and 5,290.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,269.43 : 12,790.58 = 5,290.31 : x
2. Step 2: Convert to fraction form
   9,269.43/12,790.58 = 5,290.31/x
3. Step 3: Cross multiply
   9,269.43x = 12,790.58 × 5,290.31
4. Step 4: Simplify right side
   9,269.43x = 67,666,042.88
5. Step 5: Solve for x
   x = 67,666,042.88/9,269.43
6. Step 6: Final answer
   x = 7,299.91