Finding the Fourth Proportional to 12,839.64, 17,716.96 and 7,173.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.64 : 17,716.96 = 7,173.69 : x
2. Step 2: Convert to fraction form
   12,839.64/17,716.96 = 7,173.69/x
3. Step 3: Cross multiply
   12,839.64x = 17,716.96 × 7,173.69
4. Step 4: Simplify right side
   12,839.64x = 127,095,978.78
5. Step 5: Solve for x
   x = 127,095,978.78/12,839.64
6. Step 6: Final answer
   x = 9,898.72