Finding the Fourth Proportional to 1,076.48, 1,485.60 and 610.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.48 : 1,485.60 = 610.72 : x
2. Step 2: Convert to fraction form
   1,076.48/1,485.60 = 610.72/x
3. Step 3: Cross multiply
   1,076.48x = 1,485.60 × 610.72
4. Step 4: Simplify right side
   1,076.48x = 907,285.63
5. Step 5: Solve for x
   x = 907,285.63/1,076.48
6. Step 6: Final answer
   x = 842.83