Finding the Fourth Proportional to 2,092.32, 3,139.20 and 921.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,092.32 : 3,139.20 = 921.96 : x
2. Step 2: Convert to fraction form
   2,092.32/3,139.20 = 921.96/x
3. Step 3: Cross multiply
   2,092.32x = 3,139.20 × 921.96
4. Step 4: Simplify right side
   2,092.32x = 2,894,216.83
5. Step 5: Solve for x
   x = 2,894,216.83/2,092.32
6. Step 6: Final answer
   x = 1,383.26