Finding the Fourth Proportional to 2,978.77, 4,467.81 and 787.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.77 : 4,467.81 = 787.67 : x
2. Step 2: Convert to fraction form
   2,978.77/4,467.81 = 787.67/x
3. Step 3: Cross multiply
   2,978.77x = 4,467.81 × 787.67
4. Step 4: Simplify right side
   2,978.77x = 3,519,159.90
5. Step 5: Solve for x
   x = 3,519,159.90/2,978.77
6. Step 6: Final answer
   x = 1,181.41