Finding the Fourth Proportional to 9,648.78, 13,315.83 and 5,399.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,648.78 : 13,315.83 = 5,399.58 : x
2. Step 2: Convert to fraction form
   9,648.78/13,315.83 = 5,399.58/x
3. Step 3: Cross multiply
   9,648.78x = 13,315.83 × 5,399.58
4. Step 4: Simplify right side
   9,648.78x = 71,899,889.35
5. Step 5: Solve for x
   x = 71,899,889.35/9,648.78
6. Step 6: Final answer
   x = 7,451.71