Finding the Fourth Proportional to 12,739, 17,579.94 and 7,150.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739 : 17,579.94 = 7,150.12 : x
2. Step 2: Convert to fraction form
   12,739/17,579.94 = 7,150.12/x
3. Step 3: Cross multiply
   12,739x = 17,579.94 × 7,150.12
4. Step 4: Simplify right side
   12,739x = 125,698,680.59
5. Step 5: Solve for x
   x = 125,698,680.59/12,739
6. Step 6: Final answer
   x = 9,867.23