Finding the Fourth Proportional to 1,076.71, 1,485.78 and 610.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.71 : 1,485.78 = 610.96 : x
2. Step 2: Convert to fraction form
   1,076.71/1,485.78 = 610.96/x
3. Step 3: Cross multiply
   1,076.71x = 1,485.78 × 610.96
4. Step 4: Simplify right side
   1,076.71x = 907,752.15
5. Step 5: Solve for x
   x = 907,752.15/1,076.71
6. Step 6: Final answer
   x = 843.08