Finding the Fourth Proportional to 2,787.31, 4,181.59 and 938.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,787.31 : 4,181.59 = 938.28 : x
2. Step 2: Convert to fraction form
   2,787.31/4,181.59 = 938.28/x
3. Step 3: Cross multiply
   2,787.31x = 4,181.59 × 938.28
4. Step 4: Simplify right side
   2,787.31x = 3,923,519.12
5. Step 5: Solve for x
   x = 3,923,519.12/2,787.31
6. Step 6: Final answer
   x = 1,407.64