Finding the Fourth Proportional to 9,419.36, 12,996.50 and 5,439.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,419.36 : 12,996.50 = 5,439.72 : x
2. Step 2: Convert to fraction form
   9,419.36/12,996.50 = 5,439.72/x
3. Step 3: Cross multiply
   9,419.36x = 12,996.50 × 5,439.72
4. Step 4: Simplify right side
   9,419.36x = 70,697,320.98
5. Step 5: Solve for x
   x = 70,697,320.98/9,419.36
6. Step 6: Final answer
   x = 7,505.53