Finding the Fourth Proportional to 9,993.42, 13,790.81 and 5,517.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,993.42 : 13,790.81 = 5,517.20 : x
2. Step 2: Convert to fraction form
   9,993.42/13,790.81 = 5,517.20/x
3. Step 3: Cross multiply
   9,993.42x = 13,790.81 × 5,517.20
4. Step 4: Simplify right side
   9,993.42x = 76,086,560.39
5. Step 5: Solve for x
   x = 76,086,560.39/9,993.42
6. Step 6: Final answer
   x = 7,613.67