Finding the Fourth Proportional to 1,056.72, 1,584.96 and 667.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.72 : 1,584.96 = 667.92 : x
2. Step 2: Convert to fraction form
   1,056.72/1,584.96 = 667.92/x
3. Step 3: Cross multiply
   1,056.72x = 1,584.96 × 667.92
4. Step 4: Simplify right side
   1,056.72x = 1,058,626.48
5. Step 5: Solve for x
   x = 1,058,626.48/1,056.72
6. Step 6: Final answer
   x = 1,001.80