Finding the Third Proportional to 627.50 and 853.50

Step by Step Solution

1. Step 1: Write the proportion equation
   627.50 : 853.50 = 853.50 : x
2. Step 2: Convert to fraction form
   627.50/853.50 = 853.50/x
3. Step 3: Cross multiply
   627.50x = 853.50 × 853.50
4. Step 4: Simplify right side
   627.50x = 728,462.25
5. Step 5: Solve for x
   x = 728,462.25/627.50
6. Step 6: Final answer
   x = 1,160.90