Finding the Fourth Proportional to 8,591.27, 12,945.42 and 7,065.45

Step by Step Solution

1. Step 1: Write the proportion equation
   8,591.27 : 12,945.42 = 7,065.45 : x
2. Step 2: Convert to fraction form
   8,591.27/12,945.42 = 7,065.45/x
3. Step 3: Cross multiply
   8,591.27x = 12,945.42 × 7,065.45
4. Step 4: Simplify right side
   8,591.27x = 91,465,217.74
5. Step 5: Solve for x
   x = 91,465,217.74/8,591.27
6. Step 6: Final answer
   x = 10,646.30