Finding the Fourth Proportional to 1,132.78, 1,562.79 and 660.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,132.78 : 1,562.79 = 660.59 : x
2. Step 2: Convert to fraction form
   1,132.78/1,562.79 = 660.59/x
3. Step 3: Cross multiply
   1,132.78x = 1,562.79 × 660.59
4. Step 4: Simplify right side
   1,132.78x = 1,032,363.45
5. Step 5: Solve for x
   x = 1,032,363.45/1,132.78
6. Step 6: Final answer
   x = 911.35