Finding the Third Proportional to 420.50 and 600.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420.50 : 600.50 = 600.50 : x
2. Step 2: Convert to fraction form
   420.50/600.50 = 600.50/x
3. Step 3: Cross multiply
   420.50x = 600.50 × 600.50
4. Step 4: Simplify right side
   420.50x = 360,600.25
5. Step 5: Solve for x
   x = 360,600.25/420.50
6. Step 6: Final answer
   x = 857.55