Finding the Fourth Proportional to 2,978.28, 4,467.06 and 787.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.28 : 4,467.06 = 787.17 : x
2. Step 2: Convert to fraction form
   2,978.28/4,467.06 = 787.17/x
3. Step 3: Cross multiply
   2,978.28x = 4,467.06 × 787.17
4. Step 4: Simplify right side
   2,978.28x = 3,516,355.32
5. Step 5: Solve for x
   x = 3,516,355.32/2,978.28
6. Step 6: Final answer
   x = 1,180.67