Finding the Fourth Proportional to 2,481.31, 3,723.45 and 921.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,481.31 : 3,723.45 = 921.05 : x
2. Step 2: Convert to fraction form
   2,481.31/3,723.45 = 921.05/x
3. Step 3: Cross multiply
   2,481.31x = 3,723.45 × 921.05
4. Step 4: Simplify right side
   2,481.31x = 3,429,483.62
5. Step 5: Solve for x
   x = 3,429,483.62/2,481.31
6. Step 6: Final answer
   x = 1,382.13