Finding the Fourth Proportional to 257,667.12, 355,400.72 and 248,996.88

Step by Step Solution

1. Step 1: Write the proportion equation
   257,667.12 : 355,400.72 = 248,996.88 : x
2. Step 2: Convert to fraction form
   257,667.12/355,400.72 = 248,996.88/x
3. Step 3: Cross multiply
   257,667.12x = 355,400.72 × 248,996.88
4. Step 4: Simplify right side
   257,667.12x = 88,493,670,429.75
5. Step 5: Solve for x
   x = 88,493,670,429.75/257,667.12
6. Step 6: Final answer
   x = 343,441.84