Finding the Fourth Proportional to 1,076.28, 1,485.24 and 610.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.28 : 1,485.24 = 610.56 : x
2. Step 2: Convert to fraction form
   1,076.28/1,485.24 = 610.56/x
3. Step 3: Cross multiply
   1,076.28x = 1,485.24 × 610.56
4. Step 4: Simplify right side
   1,076.28x = 906,828.13
5. Step 5: Solve for x
   x = 906,828.13/1,076.28
6. Step 6: Final answer
   x = 842.56