Finding the Third Proportional to 570.50 and 857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   570.50 : 857.50 = 857.50 : x
2. Step 2: Convert to fraction form
   570.50/857.50 = 857.50/x
3. Step 3: Cross multiply
   570.50x = 857.50 × 857.50
4. Step 4: Simplify right side
   570.50x = 735,306.25
5. Step 5: Solve for x
   x = 735,306.25/570.50
6. Step 6: Final answer
   x = 1,288.88