Finding the Fourth Proportional to 9,390.38, 12,958.74 and 5,198.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.38 : 12,958.74 = 5,198.90 : x
2. Step 2: Convert to fraction form
   9,390.38/12,958.74 = 5,198.90/x
3. Step 3: Cross multiply
   9,390.38x = 12,958.74 × 5,198.90
4. Step 4: Simplify right side
   9,390.38x = 67,371,128.59
5. Step 5: Solve for x
   x = 67,371,128.59/9,390.38
6. Step 6: Final answer
   x = 7,174.49