Finding the Fourth Proportional to 12,674.46, 17,491.42 and 7,640.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,674.46 : 17,491.42 = 7,640.28 : x
2. Step 2: Convert to fraction form
   12,674.46/17,491.42 = 7,640.28/x
3. Step 3: Cross multiply
   12,674.46x = 17,491.42 × 7,640.28
4. Step 4: Simplify right side
   12,674.46x = 133,639,346.40
5. Step 5: Solve for x
   x = 133,639,346.40/12,674.46
6. Step 6: Final answer
   x = 10,543.99