Finding the Fourth Proportional to 13,173.71, 18,179.61 and 7,205.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,173.71 : 18,179.61 = 7,205.42 : x
2. Step 2: Convert to fraction form
   13,173.71/18,179.61 = 7,205.42/x
3. Step 3: Cross multiply
   13,173.71x = 18,179.61 × 7,205.42
4. Step 4: Simplify right side
   13,173.71x = 130,991,797.46
5. Step 5: Solve for x
   x = 130,991,797.46/13,173.71
6. Step 6: Final answer
   x = 9,943.42