Finding the Fourth Proportional to 2,839.57, 4,259.34 and 787.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,839.57 : 4,259.34 = 787.57 : x
2. Step 2: Convert to fraction form
   2,839.57/4,259.34 = 787.57/x
3. Step 3: Cross multiply
   2,839.57x = 4,259.34 × 787.57
4. Step 4: Simplify right side
   2,839.57x = 3,354,528.40
5. Step 5: Solve for x
   x = 3,354,528.40/2,839.57
6. Step 6: Final answer
   x = 1,181.35