Finding the Fourth Proportional to 9,439.48, 13,026.81 and 5,190.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,439.48 : 13,026.81 = 5,190.72 : x
2. Step 2: Convert to fraction form
   9,439.48/13,026.81 = 5,190.72/x
3. Step 3: Cross multiply
   9,439.48x = 13,026.81 × 5,190.72
4. Step 4: Simplify right side
   9,439.48x = 67,618,523.20
5. Step 5: Solve for x
   x = 67,618,523.20/9,439.48
6. Step 6: Final answer
   x = 7,163.37