Finding the Fourth Proportional to 2,118.76, 3,179.10 and 1,078.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.76 : 3,179.10 = 1,078.12 : x
2. Step 2: Convert to fraction form
   2,118.76/3,179.10 = 1,078.12/x
3. Step 3: Cross multiply
   2,118.76x = 3,179.10 × 1,078.12
4. Step 4: Simplify right side
   2,118.76x = 3,427,451.29
5. Step 5: Solve for x
   x = 3,427,451.29/2,118.76
6. Step 6: Final answer
   x = 1,617.67