Finding the Fourth Proportional to 9,390.46, 12,958.64 and 5,198.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.46 : 12,958.64 = 5,198.72 : x
2. Step 2: Convert to fraction form
   9,390.46/12,958.64 = 5,198.72/x
3. Step 3: Cross multiply
   9,390.46x = 12,958.64 × 5,198.72
4. Step 4: Simplify right side
   9,390.46x = 67,368,340.94
5. Step 5: Solve for x
   x = 67,368,340.94/9,390.46
6. Step 6: Final answer
   x = 7,174.13