Finding the Fourth Proportional to 1,021.78, 1,530.56 and 848.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,021.78 : 1,530.56 = 848.04 : x
2. Step 2: Convert to fraction form
   1,021.78/1,530.56 = 848.04/x
3. Step 3: Cross multiply
   1,021.78x = 1,530.56 × 848.04
4. Step 4: Simplify right side
   1,021.78x = 1,297,976.10
5. Step 5: Solve for x
   x = 1,297,976.10/1,021.78
6. Step 6: Final answer
   x = 1,270.31