Finding the Fourth Proportional to 12,839.56, 17,718.39 and 7,174.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.56 : 17,718.39 = 7,174.42 : x
2. Step 2: Convert to fraction form
   12,839.56/17,718.39 = 7,174.42/x
3. Step 3: Cross multiply
   12,839.56x = 17,718.39 × 7,174.42
4. Step 4: Simplify right side
   12,839.56x = 127,119,171.58
5. Step 5: Solve for x
   x = 127,119,171.58/12,839.56
6. Step 6: Final answer
   x = 9,900.59