Finding the Fourth Proportional to 8,269.30, 12,389.55 and 7,117.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,269.30 : 12,389.55 = 7,117.30 : x
2. Step 2: Convert to fraction form
   8,269.30/12,389.55 = 7,117.30/x
3. Step 3: Cross multiply
   8,269.30x = 12,389.55 × 7,117.30
4. Step 4: Simplify right side
   8,269.30x = 88,180,144.22
5. Step 5: Solve for x
   x = 88,180,144.22/8,269.30
6. Step 6: Final answer
   x = 10,663.56