Finding the Fourth Proportional to 12,839.52, 17,717.88 and 7,173.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.52 : 17,717.88 = 7,173.13 : x
2. Step 2: Convert to fraction form
   12,839.52/17,717.88 = 7,173.13/x
3. Step 3: Cross multiply
   12,839.52x = 17,717.88 × 7,173.13
4. Step 4: Simplify right side
   12,839.52x = 127,092,656.56
5. Step 5: Solve for x
   x = 127,092,656.56/12,839.52
6. Step 6: Final answer
   x = 9,898.55