Finding the Third Proportional to 717.50 and 1,111

Step by Step Solution

1. Step 1: Write the proportion equation
   717.50 : 1,111 = 1,111 : x
2. Step 2: Convert to fraction form
   717.50/1,111 = 1,111/x
3. Step 3: Cross multiply
   717.50x = 1,111 × 1,111
4. Step 4: Simplify right side
   717.50x = 1,234,321
5. Step 5: Solve for x
   x = 1,234,321/717.50
6. Step 6: Final answer
   x = 1,720.31