Finding the Fourth Proportional to 3,112.39, 4,669.17 and 921.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,112.39 : 4,669.17 = 921.25 : x
2. Step 2: Convert to fraction form
   3,112.39/4,669.17 = 921.25/x
3. Step 3: Cross multiply
   3,112.39x = 4,669.17 × 921.25
4. Step 4: Simplify right side
   3,112.39x = 4,301,472.86
5. Step 5: Solve for x
   x = 4,301,472.86/3,112.39
6. Step 6: Final answer
   x = 1,382.05