Finding the Fourth Proportional to 1,722.06, 2,581.33 and 680.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,722.06 : 2,581.33 = 680.62 : x
2. Step 2: Convert to fraction form
   1,722.06/2,581.33 = 680.62/x
3. Step 3: Cross multiply
   1,722.06x = 2,581.33 × 680.62
4. Step 4: Simplify right side
   1,722.06x = 1,756,904.82
5. Step 5: Solve for x
   x = 1,756,904.82/1,722.06
6. Step 6: Final answer
   x = 1,020.23