Finding the Third Proportional to 121.50 and 263.25

Step by Step Solution

1. Step 1: Write the proportion equation
   121.50 : 263.25 = 263.25 : x
2. Step 2: Convert to fraction form
   121.50/263.25 = 263.25/x
3. Step 3: Cross multiply
   121.50x = 263.25 × 263.25
4. Step 4: Simplify right side
   121.50x = 69,300.56
5. Step 5: Solve for x
   x = 69,300.56/121.50
6. Step 6: Final answer
   x = 570.38