Finding the Fourth Proportional to 2,485.96, 3,729.72 and 1,025.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.96 : 3,729.72 = 1,025.80 : x
2. Step 2: Convert to fraction form
   2,485.96/3,729.72 = 1,025.80/x
3. Step 3: Cross multiply
   2,485.96x = 3,729.72 × 1,025.80
4. Step 4: Simplify right side
   2,485.96x = 3,825,946.78
5. Step 5: Solve for x
   x = 3,825,946.78/2,485.96
6. Step 6: Final answer
   x = 1,539.02