Finding the Fourth Proportional to 171,991.14, 258,086.34 and 72,142.44

Step by Step Solution

1. Step 1: Write the proportion equation
   171,991.14 : 258,086.34 = 72,142.44 : x
2. Step 2: Convert to fraction form
   171,991.14/258,086.34 = 72,142.44/x
3. Step 3: Cross multiply
   171,991.14x = 258,086.34 × 72,142.44
4. Step 4: Simplify right side
   171,991.14x = 18,618,978,298.27
5. Step 5: Solve for x
   x = 18,618,978,298.27/171,991.14
6. Step 6: Final answer
   x = 108,255.45