Finding the Third Proportional to 403.50 and 700.50

Step by Step Solution

1. Step 1: Write the proportion equation
   403.50 : 700.50 = 700.50 : x
2. Step 2: Convert to fraction form
   403.50/700.50 = 700.50/x
3. Step 3: Cross multiply
   403.50x = 700.50 × 700.50
4. Step 4: Simplify right side
   403.50x = 490,700.25
5. Step 5: Solve for x
   x = 490,700.25/403.50
6. Step 6: Final answer
   x = 1,216.11