Finding the Fourth Proportional to 1,057.98, 1,587.34 and 668.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.98 : 1,587.34 = 668.28 : x
2. Step 2: Convert to fraction form
   1,057.98/1,587.34 = 668.28/x
3. Step 3: Cross multiply
   1,057.98x = 1,587.34 × 668.28
4. Step 4: Simplify right side
   1,057.98x = 1,060,787.58
5. Step 5: Solve for x
   x = 1,060,787.58/1,057.98
6. Step 6: Final answer
   x = 1,002.65