Finding the Fourth Proportional to 9,377.10, 12,939.75 and 5,399.19

Step by Step Solution

1. Step 1: Write the proportion equation
   9,377.10 : 12,939.75 = 5,399.19 : x
2. Step 2: Convert to fraction form
   9,377.10/12,939.75 = 5,399.19/x
3. Step 3: Cross multiply
   9,377.10x = 12,939.75 × 5,399.19
4. Step 4: Simplify right side
   9,377.10x = 69,864,168.80
5. Step 5: Solve for x
   x = 69,864,168.80/9,377.10
6. Step 6: Final answer
   x = 7,450.51