Finding the Third Proportional to 151.31 and 322.88

Step by Step Solution

1. Step 1: Write the proportion equation
   151.31 : 322.88 = 322.88 : x
2. Step 2: Convert to fraction form
   151.31/322.88 = 322.88/x
3. Step 3: Cross multiply
   151.31x = 322.88 × 322.88
4. Step 4: Simplify right side
   151.31x = 104,248.27
5. Step 5: Solve for x
   x = 104,248.27/151.31
6. Step 6: Final answer
   x = 688.96