Finding the Third Proportional to 667.31 and 998.91

Step by Step Solution

1. Step 1: Write the proportion equation
   667.31 : 998.91 = 998.91 : x
2. Step 2: Convert to fraction form
   667.31/998.91 = 998.91/x
3. Step 3: Cross multiply
   667.31x = 998.91 × 998.91
4. Step 4: Simplify right side
   667.31x = 997,813.70
5. Step 5: Solve for x
   x = 997,813.70/667.31
6. Step 6: Final answer
   x = 1,495.27