Finding the Fourth Proportional to 3,112.92, 4,667.72 and 921.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,112.92 : 4,667.72 = 921.33 : x
2. Step 2: Convert to fraction form
   3,112.92/4,667.72 = 921.33/x
3. Step 3: Cross multiply
   3,112.92x = 4,667.72 × 921.33
4. Step 4: Simplify right side
   3,112.92x = 4,300,505.86
5. Step 5: Solve for x
   x = 4,300,505.86/3,112.92
6. Step 6: Final answer
   x = 1,381.50