Finding the Fourth Proportional to 9,500.81, 13,109.99 and 5,521.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,500.81 : 13,109.99 = 5,521.28 : x
2. Step 2: Convert to fraction form
   9,500.81/13,109.99 = 5,521.28/x
3. Step 3: Cross multiply
   9,500.81x = 13,109.99 × 5,521.28
4. Step 4: Simplify right side
   9,500.81x = 72,383,832.43
5. Step 5: Solve for x
   x = 72,383,832.43/9,500.81
6. Step 6: Final answer
   x = 7,618.71