Finding the Third Proportional to 345.50 and 484.50

Step by Step Solution

1. Step 1: Write the proportion equation
   345.50 : 484.50 = 484.50 : x
2. Step 2: Convert to fraction form
   345.50/484.50 = 484.50/x
3. Step 3: Cross multiply
   345.50x = 484.50 × 484.50
4. Step 4: Simplify right side
   345.50x = 234,740.25
5. Step 5: Solve for x
   x = 234,740.25/345.50
6. Step 6: Final answer
   x = 679.42