Finding the Fourth Proportional to 257,648.41, 386,078.48 and 137,722.42

Step by Step Solution

1. Step 1: Write the proportion equation
   257,648.41 : 386,078.48 = 137,722.42 : x
2. Step 2: Convert to fraction form
   257,648.41/386,078.48 = 137,722.42/x
3. Step 3: Cross multiply
   257,648.41x = 386,078.48 × 137,722.42
4. Step 4: Simplify right side
   257,648.41x = 53,171,659,956.52
5. Step 5: Solve for x
   x = 53,171,659,956.52/257,648.41
6. Step 6: Final answer
   x = 206,372.94