Finding the Fourth Proportional to 2,811.72, 4,217.78 and 1,080.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,811.72 : 4,217.78 = 1,080.34 : x
2. Step 2: Convert to fraction form
   2,811.72/4,217.78 = 1,080.34/x
3. Step 3: Cross multiply
   2,811.72x = 4,217.78 × 1,080.34
4. Step 4: Simplify right side
   2,811.72x = 4,556,636.45
5. Step 5: Solve for x
   x = 4,556,636.45/2,811.72
6. Step 6: Final answer
   x = 1,620.59