Finding the Fourth Proportional to 1,330.72, 1,994.46 and 681.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,330.72 : 1,994.46 = 681.10 : x
2. Step 2: Convert to fraction form
   1,330.72/1,994.46 = 681.10/x
3. Step 3: Cross multiply
   1,330.72x = 1,994.46 × 681.10
4. Step 4: Simplify right side
   1,330.72x = 1,358,426.71
5. Step 5: Solve for x
   x = 1,358,426.71/1,330.72
6. Step 6: Final answer
   x = 1,020.82