Finding the Fourth Proportional to 9,390.72, 12,958.48 and 5,198.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.72 : 12,958.48 = 5,198.88 : x
2. Step 2: Convert to fraction form
   9,390.72/12,958.48 = 5,198.88/x
3. Step 3: Cross multiply
   9,390.72x = 12,958.48 × 5,198.88
4. Step 4: Simplify right side
   9,390.72x = 67,369,582.50
5. Step 5: Solve for x
   x = 67,369,582.50/9,390.72
6. Step 6: Final answer
   x = 7,174.06