Finding the Third Proportional to 151.31 and 397.69

Step by Step Solution

1. Step 1: Write the proportion equation
   151.31 : 397.69 = 397.69 : x
2. Step 2: Convert to fraction form
   151.31/397.69 = 397.69/x
3. Step 3: Cross multiply
   151.31x = 397.69 × 397.69
4. Step 4: Simplify right side
   151.31x = 158,155.35
5. Step 5: Solve for x
   x = 158,155.35/151.31
6. Step 6: Final answer
   x = 1,045.22