Finding the Fourth Proportional to 8,339.67, 12,495.29 and 7,288.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,339.67 : 12,495.29 = 7,288.09 : x
2. Step 2: Convert to fraction form
   8,339.67/12,495.29 = 7,288.09/x
3. Step 3: Cross multiply
   8,339.67x = 12,495.29 × 7,288.09
4. Step 4: Simplify right side
   8,339.67x = 91,066,730.42
5. Step 5: Solve for x
   x = 91,066,730.42/8,339.67
6. Step 6: Final answer
   x = 10,919.70