Finding the Fourth Proportional to 2,787.57, 4,181.52 and 1,228.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,787.57 : 4,181.52 = 1,228.31 : x
2. Step 2: Convert to fraction form
   2,787.57/4,181.52 = 1,228.31/x
3. Step 3: Cross multiply
   2,787.57x = 4,181.52 × 1,228.31
4. Step 4: Simplify right side
   2,787.57x = 5,136,178.85
5. Step 5: Solve for x
   x = 5,136,178.85/2,787.57
6. Step 6: Final answer
   x = 1,842.53