Finding the Fourth Proportional to 443,139.20, 664,579.20 and 158,796.80

Step by Step Solution

1. Step 1: Write the proportion equation
   443,139.20 : 664,579.20 = 158,796.80 : x
2. Step 2: Convert to fraction form
   443,139.20/664,579.20 = 158,796.80/x
3. Step 3: Cross multiply
   443,139.20x = 664,579.20 × 158,796.80
4. Step 4: Simplify right side
   443,139.20x = 105,533,050,306.56
5. Step 5: Solve for x
   x = 105,533,050,306.56/443,139.20
6. Step 6: Final answer
   x = 238,148.76