Finding the Fourth Proportional to 257,290.50, 355,055.59 and 142,568.15

Step by Step Solution

1. Step 1: Write the proportion equation
   257,290.50 : 355,055.59 = 142,568.15 : x
2. Step 2: Convert to fraction form
   257,290.50/355,055.59 = 142,568.15/x
3. Step 3: Cross multiply
   257,290.50x = 355,055.59 × 142,568.15
4. Step 4: Simplify right side
   257,290.50x = 50,619,616,481.76
5. Step 5: Solve for x
   x = 50,619,616,481.76/257,290.50
6. Step 6: Final answer
   x = 196,741.10