Finding the Third Proportional to 856.03 and 1,321.78

Step by Step Solution

1. Step 1: Write the proportion equation
   856.03 : 1,321.78 = 1,321.78 : x
2. Step 2: Convert to fraction form
   856.03/1,321.78 = 1,321.78/x
3. Step 3: Cross multiply
   856.03x = 1,321.78 × 1,321.78
4. Step 4: Simplify right side
   856.03x = 1,747,105.67
5. Step 5: Solve for x
   x = 1,747,105.67/856.03
6. Step 6: Final answer
   x = 2,040.94