Finding the Fourth Proportional to 9,390.90, 12,960.60 and 5,358.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.90 : 12,960.60 = 5,358.72 : x
2. Step 2: Convert to fraction form
   9,390.90/12,960.60 = 5,358.72/x
3. Step 3: Cross multiply
   9,390.90x = 12,960.60 × 5,358.72
4. Step 4: Simplify right side
   9,390.90x = 69,452,226.43
5. Step 5: Solve for x
   x = 69,452,226.43/9,390.90
6. Step 6: Final answer
   x = 7,395.69