Finding the Fourth Proportional to 9,419.43, 12,996.72 and 5,439.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,419.43 : 12,996.72 = 5,439.68 : x
2. Step 2: Convert to fraction form
   9,419.43/12,996.72 = 5,439.68/x
3. Step 3: Cross multiply
   9,419.43x = 12,996.72 × 5,439.68
4. Step 4: Simplify right side
   9,419.43x = 70,697,997.85
5. Step 5: Solve for x
   x = 70,697,997.85/9,419.43
6. Step 6: Final answer
   x = 7,505.55