Finding the Fourth Proportional to 1,076.50, 1,485.57 and 610.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.50 : 1,485.57 = 610.75 : x
2. Step 2: Convert to fraction form
   1,076.50/1,485.57 = 610.75/x
3. Step 3: Cross multiply
   1,076.50x = 1,485.57 × 610.75
4. Step 4: Simplify right side
   1,076.50x = 907,311.88
5. Step 5: Solve for x
   x = 907,311.88/1,076.50
6. Step 6: Final answer
   x = 842.84