Finding the Fourth Proportional to 1,076.72, 1,485.88 and 610.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.72 : 1,485.88 = 610.96 : x
2. Step 2: Convert to fraction form
   1,076.72/1,485.88 = 610.96/x
3. Step 3: Cross multiply
   1,076.72x = 1,485.88 × 610.96
4. Step 4: Simplify right side
   1,076.72x = 907,813.24
5. Step 5: Solve for x
   x = 907,813.24/1,076.72
6. Step 6: Final answer
   x = 843.13