Finding the Fourth Proportional to 12,839.50, 17,716.76 and 7,173.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.50 : 17,716.76 = 7,173.56 : x
2. Step 2: Convert to fraction form
   12,839.50/17,716.76 = 7,173.56/x
3. Step 3: Cross multiply
   12,839.50x = 17,716.76 × 7,173.56
4. Step 4: Simplify right side
   12,839.50x = 127,092,240.87
5. Step 5: Solve for x
   x = 127,092,240.87/12,839.50
6. Step 6: Final answer
   x = 9,898.54