Finding the Fourth Proportional to 2,155.30, 3,233.40 and 923.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.30 : 3,233.40 = 923.29 : x
2. Step 2: Convert to fraction form
   2,155.30/3,233.40 = 923.29/x
3. Step 3: Cross multiply
   2,155.30x = 3,233.40 × 923.29
4. Step 4: Simplify right side
   2,155.30x = 2,985,365.89
5. Step 5: Solve for x
   x = 2,985,365.89/2,155.30
6. Step 6: Final answer
   x = 1,385.13