Finding the Fourth Proportional to 12,839.16, 17,718.08 and 7,174.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.16 : 17,718.08 = 7,174.12 : x
2. Step 2: Convert to fraction form
   12,839.16/17,718.08 = 7,174.12/x
3. Step 3: Cross multiply
   12,839.16x = 17,718.08 × 7,174.12
4. Step 4: Simplify right side
   12,839.16x = 127,111,585.15
5. Step 5: Solve for x
   x = 127,111,585.15/12,839.16
6. Step 6: Final answer
   x = 9,900.31