Finding the Fourth Proportional to 2,171.30, 3,257.24 and 921.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.30 : 3,257.24 = 921.96 : x
2. Step 2: Convert to fraction form
   2,171.30/3,257.24 = 921.96/x
3. Step 3: Cross multiply
   2,171.30x = 3,257.24 × 921.96
4. Step 4: Simplify right side
   2,171.30x = 3,003,040.38
5. Step 5: Solve for x
   x = 3,003,040.38/2,171.30
6. Step 6: Final answer
   x = 1,383.06