Finding the Fourth Proportional to 12,838.56, 17,717.01 and 7,173.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,838.56 : 17,717.01 = 7,173.42 : x
2. Step 2: Convert to fraction form
   12,838.56/17,717.01 = 7,173.42/x
3. Step 3: Cross multiply
   12,838.56x = 17,717.01 × 7,173.42
4. Step 4: Simplify right side
   12,838.56x = 127,091,553.87
5. Step 5: Solve for x
   x = 127,091,553.87/12,838.56
6. Step 6: Final answer
   x = 9,899.21