Finding the Fourth Proportional to 3,112.98, 4,667.86 and 921.44

Step by Step Solution

1. Step 1: Write the proportion equation
   3,112.98 : 4,667.86 = 921.44 : x
2. Step 2: Convert to fraction form
   3,112.98/4,667.86 = 921.44/x
3. Step 3: Cross multiply
   3,112.98x = 4,667.86 × 921.44
4. Step 4: Simplify right side
   3,112.98x = 4,301,152.92
5. Step 5: Solve for x
   x = 4,301,152.92/3,112.98
6. Step 6: Final answer
   x = 1,381.68