Finding the Fourth Proportional to 12,443.68, 17,171.58 and 7,138

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.68 : 17,171.58 = 7,138 : x
2. Step 2: Convert to fraction form
   12,443.68/17,171.58 = 7,138/x
3. Step 3: Cross multiply
   12,443.68x = 17,171.58 × 7,138
4. Step 4: Simplify right side
   12,443.68x = 122,570,738.04
5. Step 5: Solve for x
   x = 122,570,738.04/12,443.68
6. Step 6: Final answer
   x = 9,850.04