Finding the Fourth Proportional to 2,155.55, 3,233.34 and 921.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.55 : 3,233.34 = 921.92 : x
2. Step 2: Convert to fraction form
   2,155.55/3,233.34 = 921.92/x
3. Step 3: Cross multiply
   2,155.55x = 3,233.34 × 921.92
4. Step 4: Simplify right side
   2,155.55x = 2,980,880.81
5. Step 5: Solve for x
   x = 2,980,880.81/2,155.55
6. Step 6: Final answer
   x = 1,382.89