Finding the Fourth Proportional to 9,711.12, 13,398.24 and 5,518.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,711.12 : 13,398.24 = 5,518.56 : x
2. Step 2: Convert to fraction form
   9,711.12/13,398.24 = 5,518.56/x
3. Step 3: Cross multiply
   9,711.12x = 13,398.24 × 5,518.56
4. Step 4: Simplify right side
   9,711.12x = 73,938,991.33
5. Step 5: Solve for x
   x = 73,938,991.33/9,711.12
6. Step 6: Final answer
   x = 7,613.85