Finding the Third Proportional to 317.46 and 764.72

Step by Step Solution

1. Step 1: Write the proportion equation
   317.46 : 764.72 = 764.72 : x
2. Step 2: Convert to fraction form
   317.46/764.72 = 764.72/x
3. Step 3: Cross multiply
   317.46x = 764.72 × 764.72
4. Step 4: Simplify right side
   317.46x = 584,794.77
5. Step 5: Solve for x
   x = 584,794.77/317.46
6. Step 6: Final answer
   x = 1,842.10