Finding the Fourth Proportional to 2,978.36, 4,467.89 and 787.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.36 : 4,467.89 = 787.10 : x
2. Step 2: Convert to fraction form
   2,978.36/4,467.89 = 787.10/x
3. Step 3: Cross multiply
   2,978.36x = 4,467.89 × 787.10
4. Step 4: Simplify right side
   2,978.36x = 3,516,649.94
5. Step 5: Solve for x
   x = 3,516,649.94/2,978.36
6. Step 6: Final answer
   x = 1,180.74