Finding the Fourth Proportional to 2,485.54, 3,728.31 and 842.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.54 : 3,728.31 = 842.10 : x
2. Step 2: Convert to fraction form
   2,485.54/3,728.31 = 842.10/x
3. Step 3: Cross multiply
   2,485.54x = 3,728.31 × 842.10
4. Step 4: Simplify right side
   2,485.54x = 3,139,597.45
5. Step 5: Solve for x
   x = 3,139,597.45/2,485.54
6. Step 6: Final answer
   x = 1,263.15