Finding the Fourth Proportional to 12,491.60, 17,240.12 and 7,186.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,491.60 : 17,240.12 = 7,186.28 : x
2. Step 2: Convert to fraction form
   12,491.60/17,240.12 = 7,186.28/x
3. Step 3: Cross multiply
   12,491.60x = 17,240.12 × 7,186.28
4. Step 4: Simplify right side
   12,491.60x = 123,892,329.55
5. Step 5: Solve for x
   x = 123,892,329.55/12,491.60
6. Step 6: Final answer
   x = 9,918.05