Finding the Fourth Proportional to 255,978.56, 353,250.57 and 142,801.31

Step by Step Solution

1. Step 1: Write the proportion equation
   255,978.56 : 353,250.57 = 142,801.31 : x
2. Step 2: Convert to fraction form
   255,978.56/353,250.57 = 142,801.31/x
3. Step 3: Cross multiply
   255,978.56x = 353,250.57 × 142,801.31
4. Step 4: Simplify right side
   255,978.56x = 50,444,644,769.62
5. Step 5: Solve for x
   x = 50,444,644,769.62/255,978.56
6. Step 6: Final answer
   x = 197,065.90