Finding the Fourth Proportional to 2,485.48, 3,728.90 and 842.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.48 : 3,728.90 = 842.16 : x
2. Step 2: Convert to fraction form
   2,485.48/3,728.90 = 842.16/x
3. Step 3: Cross multiply
   2,485.48x = 3,728.90 × 842.16
4. Step 4: Simplify right side
   2,485.48x = 3,140,311.78
5. Step 5: Solve for x
   x = 3,140,311.78/2,485.48
6. Step 6: Final answer
   x = 1,263.46