Finding the Fourth Proportional to 9,165.30, 12,805.50 and 9,165.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,165.30 : 12,805.50 = 9,165.30 : x
2. Step 2: Convert to fraction form
   9,165.30/12,805.50 = 9,165.30/x
3. Step 3: Cross multiply
   9,165.30x = 12,805.50 × 9,165.30
4. Step 4: Simplify right side
   9,165.30x = 117,366,249.15
5. Step 5: Solve for x
   x = 117,366,249.15/9,165.30
6. Step 6: Final answer
   x = 12,805.50