Finding the Fourth Proportional to 9,369.30, 12,930.02 and 5,390.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,369.30 : 12,930.02 = 5,390.42 : x
2. Step 2: Convert to fraction form
   9,369.30/12,930.02 = 5,390.42/x
3. Step 3: Cross multiply
   9,369.30x = 12,930.02 × 5,390.42
4. Step 4: Simplify right side
   9,369.30x = 69,698,238.41
5. Step 5: Solve for x
   x = 69,698,238.41/9,369.30
6. Step 6: Final answer
   x = 7,439.00