Finding the Fourth Proportional to 9,339.96, 12,889.38 and 5,361.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,339.96 : 12,889.38 = 5,361.78 : x
2. Step 2: Convert to fraction form
   9,339.96/12,889.38 = 5,361.78/x
3. Step 3: Cross multiply
   9,339.96x = 12,889.38 × 5,361.78
4. Step 4: Simplify right side
   9,339.96x = 69,110,019.90
5. Step 5: Solve for x
   x = 69,110,019.90/9,339.96
6. Step 6: Final answer
   x = 7,399.39