Finding the Fourth Proportional to 12,400.12, 17,100.42 and 8,143.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,400.12 : 17,100.42 = 8,143.69 : x
2. Step 2: Convert to fraction form
   12,400.12/17,100.42 = 8,143.69/x
3. Step 3: Cross multiply
   12,400.12x = 17,100.42 × 8,143.69
4. Step 4: Simplify right side
   12,400.12x = 139,260,519.35
5. Step 5: Solve for x
   x = 139,260,519.35/12,400.12
6. Step 6: Final answer
   x = 11,230.58