Finding the Fourth Proportional to 257,969.37, 355,978.20 and 144,770.25

Step by Step Solution

1. Step 1: Write the proportion equation
   257,969.37 : 355,978.20 = 144,770.25 : x
2. Step 2: Convert to fraction form
   257,969.37/355,978.20 = 144,770.25/x
3. Step 3: Cross multiply
   257,969.37x = 355,978.20 × 144,770.25
4. Step 4: Simplify right side
   257,969.37x = 51,535,053,008.55
5. Step 5: Solve for x
   x = 51,535,053,008.55/257,969.37
6. Step 6: Final answer
   x = 199,771.98