Finding the Third Proportional to 328.50 and 477.38

Step by Step Solution

1. Step 1: Write the proportion equation
   328.50 : 477.38 = 477.38 : x
2. Step 2: Convert to fraction form
   328.50/477.38 = 477.38/x
3. Step 3: Cross multiply
   328.50x = 477.38 × 477.38
4. Step 4: Simplify right side
   328.50x = 227,886.89
5. Step 5: Solve for x
   x = 227,886.89/328.50
6. Step 6: Final answer
   x = 693.72