Finding the Fourth Proportional to 2,481.81, 3,724.20 and 921.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,481.81 : 3,724.20 = 921.55 : x
2. Step 2: Convert to fraction form
   2,481.81/3,724.20 = 921.55/x
3. Step 3: Cross multiply
   2,481.81x = 3,724.20 × 921.55
4. Step 4: Simplify right side
   2,481.81x = 3,432,036.51
5. Step 5: Solve for x
   x = 3,432,036.51/2,481.81
6. Step 6: Final answer
   x = 1,382.88