Finding the Third Proportional to 403.31 and 559.69

Step by Step Solution

1. Step 1: Write the proportion equation
   403.31 : 559.69 = 559.69 : x
2. Step 2: Convert to fraction form
   403.31/559.69 = 559.69/x
3. Step 3: Cross multiply
   403.31x = 559.69 × 559.69
4. Step 4: Simplify right side
   403.31x = 313,250.10
5. Step 5: Solve for x
   x = 313,250.10/403.31
6. Step 6: Final answer
   x = 776.69