Finding the Fourth Proportional to 3,105.32, 4,284.78 and 1,778.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,105.32 : 4,284.78 = 1,778.72 : x
2. Step 2: Convert to fraction form
   3,105.32/4,284.78 = 1,778.72/x
3. Step 3: Cross multiply
   3,105.32x = 4,284.78 × 1,778.72
4. Step 4: Simplify right side
   3,105.32x = 7,621,423.88
5. Step 5: Solve for x
   x = 7,621,423.88/3,105.32
6. Step 6: Final answer
   x = 2,454.31