Finding the Fourth Proportional to 1,056.27, 1,580.52 and 659.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.27 : 1,580.52 = 659.57 : x
2. Step 2: Convert to fraction form
   1,056.27/1,580.52 = 659.57/x
3. Step 3: Cross multiply
   1,056.27x = 1,580.52 × 659.57
4. Step 4: Simplify right side
   1,056.27x = 1,042,463.58
5. Step 5: Solve for x
   x = 1,042,463.58/1,056.27
6. Step 6: Final answer
   x = 986.93