Finding the Fourth Proportional to 9,369.29, 12,930.20 and 5,390.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,369.29 : 12,930.20 = 5,390.31 : x
2. Step 2: Convert to fraction form
   9,369.29/12,930.20 = 5,390.31/x
3. Step 3: Cross multiply
   9,369.29x = 12,930.20 × 5,390.31
4. Step 4: Simplify right side
   9,369.29x = 69,697,759.41
5. Step 5: Solve for x
   x = 69,697,759.41/9,369.29
6. Step 6: Final answer
   x = 7,438.96