Finding the Fourth Proportional to 1,076.72, 1,485.84 and 611.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.72 : 1,485.84 = 611.12 : x
2. Step 2: Convert to fraction form
   1,076.72/1,485.84 = 611.12/x
3. Step 3: Cross multiply
   1,076.72x = 1,485.84 × 611.12
4. Step 4: Simplify right side
   1,076.72x = 908,026.54
5. Step 5: Solve for x
   x = 908,026.54/1,076.72
6. Step 6: Final answer
   x = 843.33