Finding the Fourth Proportional to 1,328.74, 1,994.55 and 680.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.74 : 1,994.55 = 680.02 : x
2. Step 2: Convert to fraction form
   1,328.74/1,994.55 = 680.02/x
3. Step 3: Cross multiply
   1,328.74x = 1,994.55 × 680.02
4. Step 4: Simplify right side
   1,328.74x = 1,356,333.89
5. Step 5: Solve for x
   x = 1,356,333.89/1,328.74
6. Step 6: Final answer
   x = 1,020.77