Finding the Fourth Proportional to 2,978.79, 4,467.81 and 787.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.79 : 4,467.81 = 787.68 : x
2. Step 2: Convert to fraction form
   2,978.79/4,467.81 = 787.68/x
3. Step 3: Cross multiply
   2,978.79x = 4,467.81 × 787.68
4. Step 4: Simplify right side
   2,978.79x = 3,519,204.58
5. Step 5: Solve for x
   x = 3,519,204.58/2,978.79
6. Step 6: Final answer
   x = 1,181.42