Finding the Fourth Proportional to 2,155.02, 3,233.04 and 921.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.02 : 3,233.04 = 921.78 : x
2. Step 2: Convert to fraction form
   2,155.02/3,233.04 = 921.78/x
3. Step 3: Cross multiply
   2,155.02x = 3,233.04 × 921.78
4. Step 4: Simplify right side
   2,155.02x = 2,980,151.61
5. Step 5: Solve for x
   x = 2,980,151.61/2,155.02
6. Step 6: Final answer
   x = 1,382.89