Finding the Fourth Proportional to 3,112.56, 4,669.56 and 921.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,112.56 : 4,669.56 = 921.96 : x
2. Step 2: Convert to fraction form
   3,112.56/4,669.56 = 921.96/x
3. Step 3: Cross multiply
   3,112.56x = 4,669.56 × 921.96
4. Step 4: Simplify right side
   3,112.56x = 4,305,147.54
5. Step 5: Solve for x
   x = 4,305,147.54/3,112.56
6. Step 6: Final answer
   x = 1,383.15