Finding the Fourth Proportional to 12,839.06, 17,717.37 and 7,173.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.06 : 17,717.37 = 7,173.72 : x
2. Step 2: Convert to fraction form
   12,839.06/17,717.37 = 7,173.72/x
3. Step 3: Cross multiply
   12,839.06x = 17,717.37 × 7,173.72
4. Step 4: Simplify right side
   12,839.06x = 127,099,451.52
5. Step 5: Solve for x
   x = 127,099,451.52/12,839.06
6. Step 6: Final answer
   x = 9,899.44