Finding the Fourth Proportional to 12,839.49, 17,719.34 and 7,174.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.49 : 17,719.34 = 7,174.28 : x
2. Step 2: Convert to fraction form
   12,839.49/17,719.34 = 7,174.28/x
3. Step 3: Cross multiply
   12,839.49x = 17,719.34 × 7,174.28
4. Step 4: Simplify right side
   12,839.49x = 127,123,382.11
5. Step 5: Solve for x
   x = 127,123,382.11/12,839.49
6. Step 6: Final answer
   x = 9,900.97