Finding the Fourth Proportional to 2,787.42, 4,180.76 and 839.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,787.42 : 4,180.76 = 839.64 : x
2. Step 2: Convert to fraction form
   2,787.42/4,180.76 = 839.64/x
3. Step 3: Cross multiply
   2,787.42x = 4,180.76 × 839.64
4. Step 4: Simplify right side
   2,787.42x = 3,510,333.33
5. Step 5: Solve for x
   x = 3,510,333.33/2,787.42
6. Step 6: Final answer
   x = 1,259.35