Finding the Fourth Proportional to 1,285.25, 1,924.61 and 1,028.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,285.25 : 1,924.61 = 1,028.21 : x
2. Step 2: Convert to fraction form
   1,285.25/1,924.61 = 1,028.21/x
3. Step 3: Cross multiply
   1,285.25x = 1,924.61 × 1,028.21
4. Step 4: Simplify right side
   1,285.25x = 1,978,888.48
5. Step 5: Solve for x
   x = 1,978,888.48/1,285.25
6. Step 6: Final answer
   x = 1,539.70