Finding the Fourth Proportional to 1,076.72, 1,485.48 and 610.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.72 : 1,485.48 = 610.88 : x
2. Step 2: Convert to fraction form
   1,076.72/1,485.48 = 610.88/x
3. Step 3: Cross multiply
   1,076.72x = 1,485.48 × 610.88
4. Step 4: Simplify right side
   1,076.72x = 907,450.02
5. Step 5: Solve for x
   x = 907,450.02/1,076.72
6. Step 6: Final answer
   x = 842.79