Finding the Fourth Proportional to 1,132.58, 1,563.15 and 660.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,132.58 : 1,563.15 = 660.55 : x
2. Step 2: Convert to fraction form
   1,132.58/1,563.15 = 660.55/x
3. Step 3: Cross multiply
   1,132.58x = 1,563.15 × 660.55
4. Step 4: Simplify right side
   1,132.58x = 1,032,538.73
5. Step 5: Solve for x
   x = 1,032,538.73/1,132.58
6. Step 6: Final answer
   x = 911.67