Finding the Fourth Proportional to 1,033.78, 1,549.59 and 485.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,033.78 : 1,549.59 = 485.50 : x
2. Step 2: Convert to fraction form
   1,033.78/1,549.59 = 485.50/x
3. Step 3: Cross multiply
   1,033.78x = 1,549.59 × 485.50
4. Step 4: Simplify right side
   1,033.78x = 752,325.95
5. Step 5: Solve for x
   x = 752,325.95/1,033.78
6. Step 6: Final answer
   x = 727.74