Finding the Fourth Proportional to 1,053.56, 1,580.34 and 668

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.56 : 1,580.34 = 668 : x
2. Step 2: Convert to fraction form
   1,053.56/1,580.34 = 668/x
3. Step 3: Cross multiply
   1,053.56x = 1,580.34 × 668
4. Step 4: Simplify right side
   1,053.56x = 1,055,667.12
5. Step 5: Solve for x
   x = 1,055,667.12/1,053.56
6. Step 6: Final answer
   x = 1,002.00