Finding the Fourth Proportional to 2,778.05, 4,168.76 and 1,317.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.05 : 4,168.76 = 1,317.35 : x
2. Step 2: Convert to fraction form
   2,778.05/4,168.76 = 1,317.35/x
3. Step 3: Cross multiply
   2,778.05x = 4,168.76 × 1,317.35
4. Step 4: Simplify right side
   2,778.05x = 5,491,688.56
5. Step 5: Solve for x
   x = 5,491,688.56/2,778.05
6. Step 6: Final answer
   x = 1,976.82