Finding the Fourth Proportional to 339,933.55, 509,958.42 and 140,144.72

Step by Step Solution

1. Step 1: Write the proportion equation
   339,933.55 : 509,958.42 = 140,144.72 : x
2. Step 2: Convert to fraction form
   339,933.55/509,958.42 = 140,144.72/x
3. Step 3: Cross multiply
   339,933.55x = 509,958.42 × 140,144.72
4. Step 4: Simplify right side
   339,933.55x = 71,467,979,281.82
5. Step 5: Solve for x
   x = 71,467,979,281.82/339,933.55
6. Step 6: Final answer
   x = 210,241.03