Finding the Third Proportional to 711.50 and 1,090

Step by Step Solution

1. Step 1: Write the proportion equation
   711.50 : 1,090 = 1,090 : x
2. Step 2: Convert to fraction form
   711.50/1,090 = 1,090/x
3. Step 3: Cross multiply
   711.50x = 1,090 × 1,090
4. Step 4: Simplify right side
   711.50x = 1,188,100
5. Step 5: Solve for x
   x = 1,188,100/711.50
6. Step 6: Final answer
   x = 1,669.85