Finding the Fourth Proportional to 8,209.35, 11,329.47 and 5,225.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,209.35 : 11,329.47 = 5,225.31 : x
2. Step 2: Convert to fraction form
   8,209.35/11,329.47 = 5,225.31/x
3. Step 3: Cross multiply
   8,209.35x = 11,329.47 × 5,225.31
4. Step 4: Simplify right side
   8,209.35x = 59,199,992.89
5. Step 5: Solve for x
   x = 59,199,992.89/8,209.35
6. Step 6: Final answer
   x = 7,211.29