Finding the Fourth Proportional to 9,500.80, 13,108.20 and 5,521.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,500.80 : 13,108.20 = 5,521.15 : x
2. Step 2: Convert to fraction form
   9,500.80/13,108.20 = 5,521.15/x
3. Step 3: Cross multiply
   9,500.80x = 13,108.20 × 5,521.15
4. Step 4: Simplify right side
   9,500.80x = 72,372,338.43
5. Step 5: Solve for x
   x = 72,372,338.43/9,500.80
6. Step 6: Final answer
   x = 7,617.50