Finding the Fourth Proportional to 9,377.93, 12,942.47 and 5,399.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,377.93 : 12,942.47 = 5,399.21 : x
2. Step 2: Convert to fraction form
   9,377.93/12,942.47 = 5,399.21/x
3. Step 3: Cross multiply
   9,377.93x = 12,942.47 × 5,399.21
4. Step 4: Simplify right side
   9,377.93x = 69,879,113.45
5. Step 5: Solve for x
   x = 69,879,113.45/9,377.93
6. Step 6: Final answer
   x = 7,451.44