Finding the Third Proportional to 256.50 and 548.50

Step by Step Solution

1. Step 1: Write the proportion equation
   256.50 : 548.50 = 548.50 : x
2. Step 2: Convert to fraction form
   256.50/548.50 = 548.50/x
3. Step 3: Cross multiply
   256.50x = 548.50 × 548.50
4. Step 4: Simplify right side
   256.50x = 300,852.25
5. Step 5: Solve for x
   x = 300,852.25/256.50
6. Step 6: Final answer
   x = 1,172.91