Finding the Fourth Proportional to 8,200.33, 12,291.17 and 7,211.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,200.33 : 12,291.17 = 7,211.21 : x
2. Step 2: Convert to fraction form
   8,200.33/12,291.17 = 7,211.21/x
3. Step 3: Cross multiply
   8,200.33x = 12,291.17 × 7,211.21
4. Step 4: Simplify right side
   8,200.33x = 88,634,171.96
5. Step 5: Solve for x
   x = 88,634,171.96/8,200.33
6. Step 6: Final answer
   x = 10,808.62